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Manual JB update. Soft-bricked my TF300T?

Hi ppl!
First, my device failed to get the OTA Update because I deleted some system apps (see my original post).
Then I found this post where another user restored original APKs in /system/apps and managed to manually update to JB by downloading the dlpkgfile in this post.
So I proceed, restored my /system/apps (with 755 permissions), rooted with OTA RootKeeper and SuperSU, placed the dlpkgfile and command files, restarted to fastboot (Power+Vol Down) and entered Recovery mode.
The green android with the blue progress bar went for over 10 minutes, then ... the android with the RED TRIANGLE appeared
After a minute or so the device restarted, an ASUS logo with a blue progress bar ran, but then it got stuck in the ASUS logo.
I'm still able to restart to fastboot (Power+Vol Down), where a message appears:
Code:
Android cardhu-user bootloader (1.00 e) released by "US_epad-10.4.2.9-20120809" A03
, and where I have 4 choices:
1. RCK: Recovery mode, when I select this the Red Triangle appears again.
2. Android: Normal android boot, gets freeze right away
3. Fastboot USB download protocol: Tried using ADB, but don't really know what it is. Here's an image of how the device appear in my Windows PC
4. Wipe Data: Already done this, seems to wipe user data, but still gets stuck on ASUS logo
Some pictures I took of my device: http://imgur.com/I13ou http://imgur.com/Jezpn
I also tried downloading .30 firmware from ASUS website and placing the Zip contents in my SD card, then booting recovery but no luck.
It's pretty awful that everything went so bad, I'm hoping there is a solution.
Anything would be really appreciated!!!
Thanks!

benoror said:
Hi ppl!
First, my device failed to get the OTA Update because I deleted some system apps (see my original post).
Then I found this post where another user restored original APKs in /system/apps and managed to manually update to JB by downloading the dlpkgfile in this post.
So I proceed, restored my /system/apps (with 755 permissions), rooted with OTA RootKeeper and SuperSU, placed the dlpkgfile and command files, restarted to fastboot (Power+Vol Down) and entered Recovery mode.
The green android with the blue progress bar went for over 10 minutes, then ... the android with the RED TRIANGLE appeared
After a minute or so the device restarted, an ASUS logo with a blue progress bar ran, but then it got stuck in the ASUS logo.
I'm still able to restart to fastboot (Power+Vol Down), where a message appears:
Code:
Android cardhu-user bootloader (1.00 e) released by "US_epad-10.4.2.9-20120809" A03
, and where I have 4 choices:
1. RCK: Recovery mode, when I select this the Red Triangle appears again.
2. Android: Normal android boot, gets freeze right away
3. Fastboot USB download protocol: Tried using ADB, but don't really know what it is. Here's an image of how the device appear in my Windows PC
4. Wipe Data: Already done this, seems to wipe user data, but still gets stuck on ASUS logo
Some pictures I took of my device: http://imgur.com/I13ou http://imgur.com/Jezpn
I also tried downloading .30 firmware from ASUS website and placing the Zip contents in my SD card, then booting recovery but no luck.
It's pretty awful that everything went so bad, I'm hoping there is a solution.
Anything would be really appreciated!!!
Thanks!
Click to expand...
Click to collapse
You don't have a recovery to boot into
Sent from my SGH-T989 using xda app-developers app

OK, I found this tutorial about flashing ASUS firmware with fastboot: http://www.theandroidsoul.com/how-to-restore-asus-transformer-tf300t-back-to-stock/
The problem is that the following commands:
fastboot -i 0x0B05 flash system blob
fastboot -i 0x0B05 flash system US_epad-user-9.4.3.30.zip
both produce the error: "Signature mismatch"
I guess it's becaus my fastboot is newer version, since it was actually installed during the JB update, but I'm trying to flash a older .30 firmware.
I gues I will have to wait ASUS releases the new firmware for manual flashing it.
Just guessing...

benoror said:
OK, I found this tutorial about flashing ASUS firmware with fastboot: http://www.theandroidsoul.com/how-to-restore-asus-transformer-tf300t-back-to-stock/
The problem is that the following commands:
fastboot -i 0x0B05 flash system blob
fastboot -i 0x0B05 flash system US_epad-user-9.4.3.30.zip
both produce the error: "Signature mismatch"
I guess it's becaus my fastboot is newer version, since it was actually installed during the JB update, but I'm trying to flash a older .30 firmware.
I gues I will have to wait ASUS releases the new firmware for manual flashing it.
Just guessing...
Click to expand...
Click to collapse
Thank you for posting this. I wanted to try something like this with the new boot loader that came with jb but it appears flashing the older firmware will not work.
Sent from my ASUS Transformer Pad TF300T using xda app-developers app

funnel71 said:
Thank you for posting this. I wanted to try something like this with the new boot loader that came with jb but it appears flashing the older firmware will not work.
Sent from my ASUS Transformer Pad TF300T using xda app-developers app
Click to expand...
Click to collapse
You're welcome. So, do you have a clue on how to restore my older bootloader soy I can get back to .30 stock?

benoror said:
You're welcome. So, do you have a clue on how to restore my older bootloader soy I can get back to .30 stock?
Click to expand...
Click to collapse
That is exactly what I'm wanting to know if it's even possible. If I can safely downgrade, I can re-root, but I'm limited on what I can do with a locked bootloader.
Sent from my ASUS Transformer Pad TF300T using xda app-developers app

peopole!!! new firmware is out!!!
http://dlcdnet.asus.com/pub/ASUS/EeePAD/TF300T/US_epaduser_10_4_2_9_UpdateLauncher.zip
here is a direct download link!!! US version only!!!
PS: im pushing using
fastboot -i 0x0B05 flash system blob
Click to expand...
Click to collapse
[blob extracted from the above zip]
okay asus animated boot is up and i seem to successfully unbrick my device!!!!
Screens http://imgur.com/a/D7wqI

kindrudekid said:
peopole!!! new firmware is out!!!
http://dlcdnet.asus.com/pub/ASUS/EeePAD/TF300T/US_epaduser_10_4_2_9_UpdateLauncher.zip
here is a direct download link!!! US version only!!!
PS: im pushing using
[blob extracted from the above zip]
okay asus animated boot is up and i seem to successfully unbrick my device!!!!
Screens http://imgur.com/a/D7wqI
Click to expand...
Click to collapse
I don't know you mate..
But I'm so happy for you!! Glad everything worked out well! Cheers!!

Same Here!!!
Flashing the new ASUS firmware unbricked my device!!!!
Please mark this topic as SOLVED
ASUS should really make this process easier.
Thanks for all the support!
Greetings.

soft bricked?
I dont see how this is solved......I have seen some people comment they have no fastboot or recovery,
I tried to do manual update in cwm and when I rebooted with adb all I have is asus boot logo, it also does not say I have an unlocked bootloader,
I have no fastboot no recovery no adb connect all I have is asus boot logo.......volume+-power does nothing vol down + power also does nothing.
how do you flash new firmware without adb or any type of recovery?

uelabs said:
I dont see how this is solved......I have seen some people comment they have no fastboot or recovery,
I tried to do manual update in cwm and when I rebooted with adb all I have is asus boot logo, it also does not say I have an unlocked bootloader,
I have no fastboot no recovery no adb connect all I have is asus boot logo.......volume+-power does nothing vol down + power also does nothing.
how do you flash new firmware without adb or any type of recovery?
Click to expand...
Click to collapse
I have the same problem!!
please need help on this!!

AFAIK you should still have access to fastboot, I'm newbie and never messed up by unlocking the bootloader

It worked!
Thank you so much! I had this same problem with mine and couldn't find an answer anywhere until I found your post.

hmm, I lost my tablet for nearly a month then updated CM10 when prompted having connected to my new wireless. This of course (since the Oct update) put the ROM out of kilter with the bootloader. I didn't have an old ROM on the SDCARD, and old CWM so I couldn't mount an external to get a rom on. I tried pushing a rom to the SD with adb but the drivers weren't going in right and I just couldn't get any joy. I followed this thread to fastboot the current stock JB on in the hope that it would give me a fresh start but it's hanging now at the second (glossy) ASUS logo. I really don't know where to go from here. Is it possible there was a problem with the write?

erasing the memory from the boot menu worked!

biscuits said:
erasing the memory from the boot menu worked!
Click to expand...
Click to collapse
Can you tell me how you erased memory from boot menu - or maybe i understand this in different way.
I have only bootloop and it boots to CWM where i cannot mount any SD card - not internal not external.
Also Vol down + power doesnt work - there is no option to enter fastboot mode....device just bootloops and then enters CWM...
Tried to push through adb but there is no SD card to copy files. Tried different methods but cannot mount any storage...
Thanks JB update

kindrudekid said:
peopole!!! new firmware is out!!!
here is a direct download link!!! US version only!!!
PS: im pushing using
[blob extracted from the above zip]
okay asus animated boot is up and i seem to successfully unbrick my device!!!!
My fastboot is working but it seems that i cannot write anything on my internal sd card.. When i run fastboot -i 0x0B05 flash system blob
My PC shows no erros - it does all the steps. But my tablet freezes and that it - it never unfreezes, i need to power it off.
But fastboot and abd commands work - like reboot or boot into bootloader.
Click to expand...
Click to collapse

HELP stuck on boot loop with access to recovery

Basically Ive had my tf300t for just over a year
i was running stock untill the jb update shortly after I rooted and flashed cleanrom somewhere between this feb and april
the rom flashed fine using CWM 6.0.1.3 but in May my tablet was stepped on and the screen was cracked
i had it fixed when i got it back the screen had no TOUCH
So heres my issue stupid me... whatever knowledge i have about android has come off of this website
so i dont know why i figured i could do this myself
Either way when i fixed the screen i wanted to flash a new rom
so i downloaded latest pacman 4.3 and went about a proper flash i wiped data and cache in recovery
but when i went to flash the rom it appeared recovery had wiped my micro sd instead with all my backups
i ended up going into what i understand is the bootloader..its the screen with four options RCK android usb and wipe data...
i choose the later of the four options which completely wiped the tablet.. i thought it was the same procedure as in recovery
so at the moment the tablet bootloops however i can boot CWM also the screen i mentioned earlier (RCK / ANDROID / USB / WIPE DATA)... ive tried to flash a rom and i keep getting an error saying the file is bad... so now ive looked all over this forum but i really cant find anything that directy helps me i know there are issues with CWM but unfortunately i cant use the touch features which come in TWRP and my computer wont install the drivers or id try pushing the rom to the internal sd.....
really any help would be apreciated any at all just please bear in mind i need to stay on a non touch recovery
bootloader screen reads----> Android cardhu-user bootloader <1.00 e> released by "WW_epad-10.4.2.17-20121018" A03
recovery ----> CWM 6.0.1.3 and getting a lot of errors

It looks like You installed pacman on 4.1 firmware, I'm right? Most current custom ROMs can be installed only on 4.2 stock firmware. First of all try to remove all asus software and drivers for tablet from Your PC and install nacked drivers. Then reinstall stock firmware through fastboot(I hope You know how to enter fasboot mode) to fix tablet (use firmware version as You have before brick or newer).
P.S.: And CWM doesn't support new ROM as well, so use proper version of TWRP.

Graiden05 said:
It looks like You installed pacman on 4.1 firmware, I'm right? Most current custom ROMs can be installed only on 4.2 stock firmware. First of all try to remove all asus software and drivers for tablet from Your PC and install nacked drivers. Then reinstall stock firmware through fastboot(I hope You know how to enter fasboot mode) to fix tablet (use firmware version as You have before brick or newer).
Click to expand...
Click to collapse
Ok perfect i was just on the asus website and there is newer firmware available as of 2013 9 13 so i will try this out thanks so much!

Graiden05 said:
It looks like You installed pacman on 4.1 firmware, I'm right? Most current custom ROMs can be installed only on 4.2 stock firmware. First of all try to remove all asus software and drivers for tablet from Your PC and install nacked drivers. Then reinstall stock firmware through fastboot(I hope You know how to enter fasboot mode) to fix tablet (use firmware version as You have before brick or newer).
P.S.: And CWM doesn't support new ROM as well, so use proper version of TWRP.
Click to expand...
Click to collapse
OK i installed naked drivers on a pc that had never seen the tablet before or any asus device for that matter...your link to fastboot seemed really confusing to me so i just downloaded Minimal ADB and Fastboot using post 2 on this guide http://forum.xda-developers.com/showthread.php?t=2277112 and then tried to flash the stock asus firmware following instructions from post 4 but the commands all came back with problems
ill post the screenshot any input is greatly apreciated!

Try to use usb port on rear side of desktop PC. Front usb ports and laptops can cause problems to fastboot.

Alright I'll have to find a desktop thanks for your help and as far as the commands I used, was i doing everything right? is there difference in commands when flashing a custom ROM and flashing stock firmware through fastboot?
I can use commands like fastboot reboot-bootloader and fastboot devices they work successfully
Sent from my SAMSUNG-SGH-T989 using xda app-developers app

Tried on my old desktop running xp using the back USB port and got the same errors I also tried extracting the blob from the rom and flashing that and got no response from fastboot. after an hour I reset the tablet and nothing has changed...
Sent from my SAMSUNG-SGH-T989 using xda app-developers app

Try to use following command with blob file from unpacked stock firmware
Code:
fastboot -i 0x0B05 flash -w -u staging blob
.

Still no response from fastboot but I found this thread not sure if it applies to my case but I'm going to try later
http://forum.xda-developers.com/showthread.php?t=2179874&page=19
Aperently these commands will fix the issue... Asus was charging $200 for a motherboard replacement
fastboot erase system
fastboot erase recovery
fastboot erase userdata
fastboot erase boot
fastboot erase misc
fastboot erase cache
fastboot -i 0x0B05 flash system blob

PLEASE HELP - Stuck in Loading

Hi guys,
I need help. My kid's Asus TF300T suddenly got stuck at the loading process. I turn it on, and it keeps loading and then reboot itself and kept loading again. This keeps going forever.
The bootloader is unlocked and I had a custom ROM on it, though I don't remember what it is.
I am still able to enter recovery (TWRP 2.4.4.0) while pressing the vol - and Power buttons.
But what else can I do? How do I get the tablet to work again?
Thanks so much.

smokarz said:
Hi guys,
I need help. My kid's Asus TF300T suddenly got stuck at the loading process. I turn it on, and it keeps loading and then reboot itself and kept loading again. This keeps going forever.
The bootloader is unlocked and I had a custom ROM on it, though I don't remember what it is.
I am still able to enter recovery (TWRP 2.4.4.0) while pressing the vol - and Power buttons.
But what else can I do? How do I get the tablet to work again?
Thanks so much.
Click to expand...
Click to collapse
I'm assuming that "loading" means that the boot animation is still working, but not going into Android at the end of it.
You can first try clearing the cache in TWRP: Go to the WIPE category and only select Dalvik Cache and Cache and wipe those. Reboot and see if anything changed.
If that doesn't work, then you can try factory resetting, but this will erase all data not backed up on the tablet. Do NOT wipe data from the fastboot menu. Only factory reset from within TWRP.

cmendonc2 said:
I'm assuming that "loading" means that the boot animation is still working, but not going into Android at the end of it.
You can first try clearing the cache in TWRP: Go to the WIPE category and only select Dalvik Cache and Cache and wipe those. Reboot and see if anything changed.
If that doesn't work, then you can try factory resetting, but this will erase all data not backed up on the tablet. Do NOT wipe data from the fastboot menu. Only factory reset from within TWRP.
Click to expand...
Click to collapse
Yes, that's correct. It's at the boot animation and never get into Android.
I tried to wipe Cache and Dalvnik but that didn't help.
I also just tried Factory Reset, and it did not help either.
Is there anything else I can do? I can try to flash the ROM again, but I just don't remember which ROM I had on it.

smokarz said:
Yes, that's correct. It's at the boot animation and never get into Android.
I tried to wipe Cache and Dalvnik but that didn't help.
I also just tried Factory Reset, and it did not help either.
Is there anything else I can do? I can try to flash the ROM again, but I just don't remember which ROM I had on it.
Click to expand...
Click to collapse
Before you enter TWRP, the bootloader information appears in the top left corner of your screen. Which bootloader version are you on and what does the boot animation say/look like?

It says:
Key driver not found... Booting OS
Android cardhu-user bootloader <1.00 e> released by 'US_epad-10.6.1.8-20130225" A03
Starting Fastboot USB download protocol.
Then I had the option to select RCK - Android - Wipe Data
When I selected RCK, it brings me to TWRP.
The boot animation has the word ANDROID flashing from left to right. It probably was a custom boot animation.
Please let me know if you need anything else.
Thanks

Any suggestions guys?
How can I get this tablet to boot again?
Thanks

smokarz said:
It says:
Key driver not found... Booting OS
Android cardhu-user bootloader <1.00 e> released by 'US_epad-10.6.1.8-20130225" A03
Starting Fastboot USB download protocol.
Then I had the option to select RCK - Android - Wipe Data
When I selected RCK, it brings me to TWRP.
The boot animation has the word ANDROID flashing from left to right. It probably was a custom boot animation.
Please let me know if you need anything else.
Thanks
Click to expand...
Click to collapse
So what I would do is first flash an updated Stock ROM via fastboot: http://forum.xda-developers.com/showthread.php?t=1697227
Flash the "ASUS Transformer Pad TF300T Firmware: V10.6.1.27.5" for your region. Then it will reset.
Then using fastboot, you can follow this guide: http://forum.xda-developers.com/showpost.php?p=48508679&postcount=7
And you should be up and running with a new CM11 ROM.

cmendonc2 said:
So what I would do is first flash an updated Stock ROM via fastboot: http://forum.xda-developers.com/showthread.php?t=1697227
Flash the "ASUS Transformer Pad TF300T Firmware: V10.6.1.27.5" for your region. Then it will reset.
Then using fastboot, you can follow this guide: http://forum.xda-developers.com/showpost.php?p=48508679&postcount=7
And you should be up and running with a new CM11 ROM.
Click to expand...
Click to collapse
Thanks cmendonc2,
I really want to make sure I got this right, please let me know if I am missing anything.
1) Install adb/fastboot on my PC
2) Flash Updated Stock Rom via fastboot (which is the latest stock rom and where can I get it?) Do I reboot the tablet after I flashed this?
3) Flash TF300T Firmware: V10.6.1.27.5 via fastboot. I guesss reboot again after I flashed the firmware?
4) Then follow the last link you posted to flash CM11?

smokarz said:
Thanks cmendonc2,
I really want to make sure I got this right, please let me know if I am missing anything.
1) Install adb/fastboot on my PC
2) Flash Updated Stock Rom via fastboot (which is the latest stock rom and where can I get it?) Do I reboot the tablet after I flashed this?
3) Flash TF300T Firmware: V10.6.1.27.5 via fastboot. I guesss reboot again after I flashed the firmware?
4) Then follow the last link you posted to flash CM11?
Click to expand...
Click to collapse
1.) The minimal software from here should work fine: http://forum.xda-developers.com/showthread.php?p=42407269
2.) The Stock ROM is the tf300t firmware: V10.6.1.27.5 from here: http://forum.xda-developers.com/showthread.php?t=1697227 Reboot.
4.) Then follow the guide.

Thanks again,
What are the commands to flash rom and reboot/

smokarz said:
Thanks again,
What are the commands to flash rom and reboot/
Click to expand...
Click to collapse
Extract the blob from the zip file and put it in the fastboot folder:
Code:
fastboot -i 0x0B05 flash system *blob name*
That will take a while and you can watch the progress meter on the device.
Code:
fastboot reboot
will reboot it then.

Thank you. And with fastboot, I don't need to flash the necessary TWRP?
Sent from my HTC One using Tapatalk

smokarz said:
Thank you. And with fastboot, I don't need to flash the necessary TWRP?
Sent from my HTC One using Tapatalk
Click to expand...
Click to collapse
Well if you install everything by fastboot, you don't need TWRP. But if something goes wrong and a computer isn't nearby or stops working, having an onboard recovery is essential.

Hopefully, this will be the last question.
Before I use fastboot, should I power up the tablet with the Vol- & Power and then go into RCK mode?
And I don't see a link to download this from that thread.
ASUS Transformer Pad TF300T Firmware: V10.6.1.27.5 Only for US SKU (Android 4.2) - 2013.09.13 update

I downloaded the stock firmware straight from the ASUS website, I hope that was correct.
I ran fastboot, and this is the result of it.
When I did fastboot reboot, the device did not reboot at all and I had to manually power it off.
Now, when I power it on. I am stuck at the ASUS screen, it does even get to the bootloader animation.
Did I do something terribly wrong?

smokarz said:
I downloaded the stock firmware straight from the ASUS website, I hope that was correct.
I ran fastboot, and this is the result of it.
When I did fastboot reboot, the device did not reboot at all and I had to manually power it off.
Now, when I power it on. I am stuck at the ASUS screen, it does even get to the bootloader animation.
Did I do something terribly wrong?
Click to expand...
Click to collapse
Thats weird, the colored text used to be a link to a download in that thread...
What firmware zip did you download? I've never seen that error before. What was the exact name of the file?

cmendonc2 said:
Thats weird, the colored text used to be a link to a download in that thread...
What firmware zip did you download? I've never seen that error before. What was the exact name of the file?
Click to expand...
Click to collapse
I downloaded this file from the ASUS website.
TF300T-US_epad-10_6_1_27_5-UpdateLauncher.zip

smokarz said:
I downloaded this file from the ASUS website.
TF300T-US_epad-10_6_1_27_5-UpdateLauncher.zip
Click to expand...
Click to collapse
And which file did you extract to flash?

After I extracted, I got this file.
US_epad-user-10.6.1.27.5
And that is the file I used to flash.

smokarz said:
After I extracted, I got this file.
US_epad-user-10.6.1.27.5
And that is the file I used to flash.
Click to expand...
Click to collapse
extract one more layer and get the blob file. Then flash with the blob file.

[Q] TF300T - No Bootloader - No Fastboot - Yes ADB - Yes PDX

Well I went to install OmniRom 4.4.2 in my TF300T and when I reached the step to fully wipe it from recovery I did that and it took too long so I tought that it hangs up so I switched it off now everytime I try to boot it up it go on the Asus logo screen with this device is unlocked and then boot to the TWRP logo and stays there looping on it. Whenever I try to switch it on it will auto boot up and go all the way to the TWRP logo again.
What works?
From the TWRP Logo my PC is seeing my device and I installed the drivers from the Universal Naked Drivers but only ADB commands work
When I type: adb devices
It will write me this:
[device code] recovery
but when I write: fastboot devices
it will write nothing
I can also hold the volume up + power button to boot in APX mode.
In Short:
ADB commands working
APX mode working
Fastboot commands not working
My device got no bootloader now I think since I wiped it. Can I re flash recovery using ADB only withotu Fastboot?
Also I don't got any Nvflash blob files backups for my device :/ is it possible to use someone elses blob files? my SKU is WW.
(If possible pls tell me where to download the blob files and what steps I need to take.)
Or just put my tablet in the bin?
Thanks and hope I fix it pls reply.

Using other nvflash backup files to restore bootloader is possible, but not fully legal (and no one will help you, hopefully i'm working on it and i'm going to restore backed up files from other tablet)
If you have adb connection you can try to use dd command to flash official asus firmware blob or flash twrp blob for your bootloader version (4.1 or 4.2) into mmcblk0p4 partition. Unfortunately flashing can go wrong and you can get only asus logo and working apx mode, or when flashing is finished you will not see moving bar under asus logo after reboot (what means flashing partition(s)).

Unbrickable tf300t

Hello everyone. I am new around here and totally new with android devices. I got my tf300t, installed twrp and flashed to the newest android version. Then my dad suddendly pressed something like restore to the manufactory setting and after that it rebooted and just keep booting with teamwin logo. I can not access twrp recovery mod, it is just in boot loop. I managed to get adb to work, but no fastboot since it does not boot into recovery mode. When I am in adb I can browse the device but the adb reboot bootloader does not work at all. It just hangs there. I can not power off the device because it does not let me, I can not boot into recovery mode with powerbutton and volume down button. After a long power button press it only reboots. I even tried with hard reset button but still the same. Could You please help me somehow? I really need that device for school and I would like to get back into the stock android. Thank you so much for any help.
//edit : I also forget to mention, when I execute adb deviced it shows:
List of devices attached
0123456789ABCDEF recovery
Also the device is unlocked.

Did you tried: adb reboot recovery ?
Did you tried to flash recovery again?
Be sure to use the right recovery for your bootloader. Did you upgraded bootloader to latest ASUS one? One then you're able to flash current recoveries like TWRP like 2.8.5.0 oder 2.8.7.0.
Edit: Also take a look here -> http://droidmodderx.com/prime/?page_id=74

Hello sir. Thank you for answering. I tried adb reboot recovery and it just hangs to be executed... But the tablet is still flashing the teamwin logo. I have the same bootloop as the guy on youtube called Francis Domingo and video called Samsung s5 stuck at TWRP Recovery boot loop (unfortunately I can not add link here).
//edit: Thank you for the link. It look like I have to use option 1a. Is it safe to use that command and I will not make it even more bricked? Thank you so much
//edit2: Now I just realized how to turn off the device to stop from rebooting. I just long pressed power button and up volume button and after the screen went black I kept holding the up volume button. I didn't work with down volume button or if I stopped holding the up volume button after black screen it rebooted again.
//edit3 : Let's say if I get to the twrp mode with option 1a from the link, what do I have to do next to get back to the stock rom (I think it was something like 4.0.3) ? Thank you

What the guy does in 1a is wiping mmcblk0p3.
Afaik mmcblk0p3 is the staging partition. That would be my guess anyway if you had access to fastboot. Usally when you can't boot into recovery, something is wrong in staging. I got the same problem 2 days ago. In this case you usually wipe staging partition via fastboot.
Since you got no fastboot access, you have to try with adb.
After cleaning the staging partition you can flash any recovery you want back again.
The recovery must be flashed to mmcblk0p4 <- 4!!! is the recovery partition. (but you should wipe mmcblk0p3 (3!!!) before)
So I would say, try what solution 1a suggests.
Edit: You can go back to stock android if you want, but there is no reason for this. My advice would be to unlock and root your device, upgrade to latest boot loader (which is done by upgrading to latest stock rom), then flash TWRP 2.8.5.0 and then a useful ROM on top. I'm using the one from timduru which is very nice. You can find it here: http://forum.xda-developers.com/transformer-tf300t/development/rom-t2932783

Thank you for the answer. Could you please write a step by step to get out of brick and to get the stock version, because the newer one I installed was many times slower. The reason why I would like to have step by step is because I don't wanna mess it even more than it is. Thank you so much.
//the stock rom was much more faster than the one I have installed, I mean... the boot time wad unbelievable slow, same with responses and wifi problem. If there is any other faster rom than stock I would be happy but I don't wanna mess with any bugs or slow boot speed and I can not wait minutes until it boots.

Hm, try the Option 1a from the link.
If done, boot into current recovery. Tell me which version and which recovery do you have.
Top on this we can decide what to do to flash a good ROM.

I had the exact same thing happen to me yesterday. Option #1 worked for me.
I did the steps from option #1 and powered down using the volume up + power. I then tried to boot into TWRP recovery, which only reproduced the same issue.
I redid the option #1 steps, and this time powered down using the power + volume down. I powered back up normally, and it rebooted normally into the ROM.
The tablet now works normally, and I can also boot back into TWRP recovery with no issues.
Thanks for the thread and the link.

Thank you so much Catscratch! After I executed both command from option 1a I can get into the screen, where it shows three options: RCK, Android, Wipe Data
In the top left corner, there is written:
Key driver not found.. Booting OS
Android cardhu-user bootloader <1.00 e> released by "WW_epad-10.6.1.27.5-20130902" A03
Starting Fastboot USB download protocol
The tablet can boot into the last ROM but as I said, I would like to have the faster and less buggy rom than this. When I open the settings and click about button there is written: CyanongenMod: 12.1-20150814-NIGHTLY-tf300t and Android version 5.1.1.
If I start RCK it just brings me back to the loop, but now I have fastboot available as it said above and I can list the fastboot devices on computer, which I couldn't before. Should I just execute this command from the computer "fastboot -i 0x0B05 flash system blob" and then "fastboot reboot" or should I download ROM from asus.com/Tablets/ASUS_Transformer_Pad_TF300T/HelpDesk_Download/ -> OS Android -> Firmware and now I don't know which should I choose: If JP or CN or WW or US or TW (Probably US right?). After that should I execute "fastboot -i 0x0B05 flash recovery firmware.img" and then "fastboot reboot" ? Or which ROM should I download to make it even faster and less buggy than stock ROM? Thank you so much again, You saved my tablet
//After I unzipped downloaded US ROM there is no img file. If I remember right the img file is only recovery to reflash the actual one and then when I start the twrp recovery I will select zip file with rom right?

OK, first of all to continue...I assume you got root access. (I think you should have, because you already got CM installed)
Next. Downloads.
Download: https://twrp.me/devices/asusTF300T.html
Also Download ROM+SuperSU: http://forum.xda-developers.com/transformer-tf300t/development/rom-t2932783
And GApps: http://forum.xda-developers.com/android/software/app-minimal-gapps-gapps-lp-20150107-1-t2997368
Push all files to sdcard with "adp push" or in CM. Like you want.
Flash TWRP. (you can skip this step if you already got TWRP 2.8.5.0 or higher version). You don't need latest one.
fastboot -i 0x0b05 flash recovery twrp.img
fastboot reboot
- or -
adb reboot recovery
Now, go into recovery and wipe everything:
- cache
- dalvik
- system
- data
After that flash ZIPs from sdcard. (use "add more zips" option)
1. ROM
2. Gapps
3. SuperSU
Next: Wipe cache and dalvik again (only these two).
Reboot and wait. First boot can take some minutes.

Thank you so much again. Everything work perfectly The rom looks a lot faster than the older one I had there. No issues yet at all. Just awesome. Thank you so much. Really appreciate your kindness and help. You have a nice day !

Thanks. Have fun with your tf300.