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I almost had a heart attack last night doing some kernel work. This is what happened, and how I got out of it.
I had just finished compiling a kernel I was working on and was excited to flash it and give it a run. So I built the boot.img and did
Code:
adb reboot bootloader
I got into the bootloader and
Code:
fastboot flash boot [B][I]boot.zip[/I][/B]
fastboot reboot
Working quickly, a got a little sloppy. Most unfortunately, I had a boot.zip in the same folder as the boot.img so boot.zip got flashed to the boot partition. Upon reboot, I got the usual splash screen but the upper left hand corner indicated I was in "RSD Mode 3". I pressed and held Vol up + power to get into bootloader but that was unresponsive. All I could do was press Vol Down + power which brought me back to the same state. I was unable to issue fastboot commands from here as well. This is what I did to fix it.
While I was in "RSD Mode 3" I did
Code:
fastboot flash boot boot.img
Even though there was no response from the device, I pressed Vol Down + power until the screen went black. I then quickly pressed and held Vol Up + power. The device then went into the bootloader, received the queued command from fastboot, and flashed the boot.img. Finally, I did
Code:
fastboot reboot
and was back in the game.
Guys, I think the moral of the story is to slow down and be careful with fastboot. You can bet i'll be a little more careful
good post I'm sure this will help devs in the future
way to stay calm under pressure lol. good info.
Small world, I used to live in Fontana for 25 years and moved to NY couple of years ago Oh and thanks for the tip
Ran into this today, i had a similar, but different experience..hope this helps
Once i got into the RSD 3 mode, fastboot commands were basically dead...all i would get was <waiting for device>...
in order to get out, i had to hold BOTH VOL+ and VOL- and Power at the same time, then as soon as the screen turned off, I had to press VOL- and power at the same time to get to a 'regular' looking boot screen. I saw regular because there was no text at the top ofthe screen; however fastboot commands would work here. Because i FUBAR'd a kernel install, i just did
fastboot flash boot boot.img
fastboot reboot
and voila...it was alive again
a bit scary though
Ok, so I definitely know the heart attack feeling, and hopefully someone here can help me out. I got my Xoom today(wifi), and went looking for a root. I found a link to a root here that -said- it worked for both 3g and wifi models(found out later that it doesn't, obviously). So, I flashed the boot image, and came up with the RSD message. At that point all fastboot and adb capability was lost, and I can't seem to get it back.
Here's what happens with the following button combo's:
Hold Power+VolUp and release on screen-black: Motorola splash screen(dual core etc) with no text in corner
Hold Power+VolUp until after the splash comes up: splash with "Starting RSD protocol support 3"
Hold Power+VolUp and then hold VolDown immediatedly afterward: Splash screen with "Starting Fastboot protocol support."
Hold Power+VolUp and then VolDown after waiting a second: Splash screen with NvFlash/RSD/Fastboot menu
Hold Power+VolUp and then press VolUp again: Splash with "Starting RSD protocol support 3"
If I choose Fastboot from the menu, it just sits at the "starting fastboot protocol support".
If I choose RSD, it gives me the "starting RSD protocol support 3"
If I choose NvFlash, it says "entering nvFlash (something) and the screen immediately goes black and the notification led comes on (sits there until reboot)
No other button combinations seem to do anything. Holding Power+VolDown doesn't do anything from any mode, and Power+VolUp+VolDown acts just like Power+VolUp.
In any mode, I can't issue fastboot or adb commands. Fastboot simply says <waiting for device> for anything. I tried the advice above, to queue up a "good" boot.img (from here at xda), but it doesn't recognize it on a reboot from/to any mode I can get to. I've tried each about 20-30 times now, and I'm about ready to test the thing's shatter-resistance with my fist, so any help here would be -greatly- appreciated.
Quick update to previous post: Resolved!!
My advice? If you get stuck unable to fastboot or adb in linux, try it in windows. I hadn't booted into win for over a year, so it never occured to me until I saw someone mention it in the Tiamat thread. Even a fresh JDK/SDK install in Ubuntu didn't work for me. I didn't have any tools or SDK's installed in my winXP partition, but after a quick install, it worked first time, so now I'm the happy owner of a rooted Wifi Xoom with SD card.
Once again, the XDA forum saves the day. I love this place.
I recommend everyone keep a backup copy of their system.img around just in case too. I was going nuts after messing with my framework-res.apk file to get SMS working (for the verizon web account activiation message). I used root explorer, and BAM! crash, crash, FC, FC, then stuck at the moto logo at boot. I couldnt get it back with just a boot.img flash. I went for broke and found a post of the HI66 system.img. it was HUGE, dont know if thats what I needed. but flashed that and I was back in business as nothing else was working and couldnt get ADB to take to push the old framework-res.apk.
I have a similar issue. I have tried for over three hours now to understand why I cannot reboot into fastboot. It seems lika I have lost both fastboot and NVflash. Only RSD mode and a logo screen without text. Can't shut it down with powerbutton or factory reset. I tried to root it with a 3g boot.img whitch was terribly wrong on a wifi-only xoom and I'm now trying to flash a stock wifi boot.img. It just sits there on the M dual core screen.
What can I do from RSD mode 3?
EDIT: I have a feeling that it has freezed on that logo screen. I want to try a hard reset and the only way for me is to try to first shut it down then power it on again. Don't know if it helps but it is silly to be unable to stop it. How can I shut it down?
I've tried all the suggestions above with no luck
Will try a windows machines tonight to see if that will help, but I fear I will need to send my Xoom back to mfg for rework
may seem a stupid suggestion but what if you let the battery go dead. it will turn off. Then connect to power supply and do a fast boot restart, holding power button and vol down.
Just a thought!
I will try but I think I already tried that. It seems like boot and recovery is dead. I tried to flash the 3g .sbf file today. Thought that an already bricked tab couldn't be more bricked and perhaps it would restore the recovery or boot but RSD Lite couldn't do it. It's unvisible for a computer. I've tried both win7 and my Arch Linux box. The device is dead. Hopefully they wont have to replace the motherboard. I'm sending it for repair on Monday.
mines bricked also says
failed image lnx 0x0002
starting rsd mode 2
i can get it in the fastboot protocol mode with the - button and power but cmd window says waiting on device. my started after i did an fastboot oem lock with a bad kernel.
dogma444 said:
mines bricked also says
failed image lnx 0x0002
starting rsd mode 2
i can get it in the fastboot protocol mode with the - button and power but cmd window says waiting on device. my started after i did an fastboot oem lock with a bad kernel.
Click to expand...
Click to collapse
iirc the Failed Image lnx 0x0002 is due to locking the boot loader with custom stuff.
Unplug xoom usb
boot into fastboot
plug in xoom usb
fastboot oem unlock
orionshock said:
iirc the Failed Image lnx 0x0002 is due to locking the boot loader with custom stuff.
Unplug xoom usb
boot into fastboot
plug in xoom usb
fastboot oem unlock
Click to expand...
Click to collapse
Man that just sound to easy to work. ADB has no clue the device is.....wel, a device! Its like my xoom de-evolutionized to a primitive state and is suffering from tourrets. Anyway command typed in adb gives you back < waiting for device >. I've tried just about all the techniques here on the forums. And the people who claim to have been brought back to life are not victims of this "RSD mode 2" Im pretty sure this is like a failsafe if you blow up the original bootloader, 3. IDK though, pretty sure they are going to require some hardware replacements. Im not sure people are recognizing the degree of our bricks. These are what appear to be real BRICKS. no "soft" ness up in here. straight up cement
http://forum.xda-developers.com/showthread.php?t=1041192
adb wait-for-device && adb reboot recovery
tried this command and seemed pretty slick but, still nothing
Same thing here, was there any solution?
Give this a try:
http://forum.xda-developers.com/showthread.php?t=1079784
Please, I have same problem, but I can just reset it by pressing and holding Vol Up + Power On. When I press Vol Down + Power Down, nothing happens. If I press Vol Down when it restarts, it doesn't show me the message but shows the Motorola Dual Core logo and stops. Even in this situation I can't comunicate via usb. Now it just turn off when the battery is totally low.
I CAN boot into fastboot mode and issue fastboot commands from CMD. apparently mine is booting into RMD 3 mode or whatever it's called. when I boot normally (just hold down power button, I get the moto dual-core screen, and then it boots into the Clockwork Recovery Mod... PLEASE HELP
Yesterday I went to go on my Motorola xoom wifi and boot logo was displayed and the back was very warm. Reset the device and it stayed on boot logo. Tablet was running fine the day before. I tried fastboot, RSD and recovery and the pc only discovers Xoom in RSD mode, Recovery does not even load. I grabbed RSD lite and tried to flash a sbf file. program detects tablets flashes rom and reboots tablet when finished. then the program sits there counting up to 100% then says "please manually power up this phone". If I reboot tablet stays at logo screen. Is there any way to sort, bear in mind I cant only connect to tablet in RSD mode. tried 2 computers and four cables and still fastboot is waiting for device.
Thank you for reading this post.
Current device Properties in RSD Lite.
IMEI/ESN/MEID: N / A
Technology: N / A
Software Version: N / A
Flex Version: N / A
Boot Version: N / A
DRM Version: N / A
Your battery might be bad but try these with your xoom plugged into a power source.
Can you get into recovery? with power off press the power button 3 seconds after moto logo press volume down you will see recovery across top press vol up. If you can do a factory wipe
Have you tried getting into fastboot mode? with power off press press power while holding vol down. if you can we can try and fastboot the files.
If I select recovery I get
-->Android Recovery
Entering Android Recovery Mode
and the Motorola Logo in center of screen. Nothing else Happens.
In Fastboot mode Nothing shows in Device Manager and all I get at cmd is Waiting for device after "fastboot devices" command
I managed to flash "HUBWF_W5.H.6.4-20_SIGNED_UCAHUBLWFRTCOREEU_P010_A010_M004_HWwifi_hubble_AP1FF" in RSD Lite but same prob loads boot logo and nothing else. Is it possible this could be a cpu error ? as rom was running at 1.5ghz and if stuck in boot at 1.5ghz for a few hours more likely damage would occur.
I don't think it is the cpu overclock because when you flash a new rom it would wipe your settings.
Do you have adb install on your pc?
I have adb installed on pc yes but no way to talk to the tablet.
Thank you for your response.
Do you have another device such as your phone you can plug in to your pc and see if adb is working by typing adb devices.
dfib1 said:
Do you have another device such as your phone you can plug in to your pc and see if adb is working by typing adb devices.
Click to expand...
Click to collapse
If I plug my HTC one X into the computer both fastboot and adb list it.
Thank you for your response.
The only thing I can think of is that the battery is going bad and causing issues. Since you flash new software, can't get out of the bootloop and the back is hot I would see about replacing it. You can try a soft reset but I don't think it will help. hold down both vol buttons and the power button until your xoom restarts.
I am not 100% sure if it is your battery but I am out of suggestions. I know when the batteries go bad in our devices it can cause issues.
http://www.portatronics.com/product_info.php?info=p9278_Motorola-Xoom-Battery-Original.html
First,
I really want to thank everyone for their support in this forum. Everyone has been amazing.
I was trying to bring my MZ601 back to stock yesterday. Something bad happened during fastboot and asked me if I wanted to unlock my device. Then the screen locked up and didnt do anything. I rebooted the device and now it gets stuck in a boot loop with the EOS symbol (last rom I installed). When I enter recovery there is nothing there, all of my data is gone.
Worse the device is not recognized on my computer nor can it be found in adb fastboot. I have updated motorola drivers, but I think the device never gets past a certain point in order to be found.
Can somebody please help me.
Thanks,
Pretty impossible to brick XOOM's but i'll ask the basics. Can you get into recovery from a cold boot? Can you get into fastboot from a cold boot?
By the sounds of it you've just corrupted your rom or tried to re-unlock the device which would cause the entire sdcard partition to be erased.
Boot XOOM into Recovery, Fastboot, or RSD mode
So you need to get into Recovery to backup your XOOM (you do nandroid don't you?). Or perhaps you were working on creating new levels of awesome and something happend and you find yourself staring at the Motorola Dual Core boot screen with your XOOM refusing to boot any further. Fear not, you are only a few clicks away from finding your way back into recovery or fastboot goodness.
Turn your XOOM off
Press Power to turn your XOOM back on
When the Motorola Dual Core boot screen appears tap Volume Down repeatedly until "Android Recovery" is displayed
Press Volume Up to enter Recovery
You can also choose from Fastboot protocol support and RSD mode by using the same method but instead selecting their respective menu prompts.
Note:
If your XOOM is caught in bootloops or you find yourself stuck in RSD mode or Fastboot Protocol support you can hardware reboot your XOOM by pressing and holding Volume Up + Power until the tablet reboots (usually a few seconds but could be longer).
demunted said:
Pretty impossible to brick XOOM's but i'll ask the basics. Can you get into recovery from a cold boot? Can you get into fastboot from a cold boot?
By the sounds of it you've just corrupted your rom or tried to re-unlock the device which would cause the entire sdcard partition to be erased.
Boot XOOM into Recovery, Fastboot, or RSD mode
So you need to get into Recovery to backup your XOOM (you do nandroid don't you?). Or perhaps you were working on creating new levels of awesome and something happend and you find yourself staring at the Motorola Dual Core boot screen with your XOOM refusing to boot any further. Fear not, you are only a few clicks away from finding your way back into recovery or fastboot goodness.
Turn your XOOM off
Press Power to turn your XOOM back on
When the Motorola Dual Core boot screen appears tap Volume Down repeatedly until "Android Recovery" is displayed
Press Volume Up to enter Recovery
You can also choose from Fastboot protocol support and RSD mode by using the same method but instead selecting their respective menu prompts.
Note:
If your XOOM is caught in bootloops or you find yourself stuck in RSD mode or Fastboot Protocol support you can hardware reboot your XOOM by pressing and holding Volume Up + Power until the tablet reboots (usually a few seconds but could be longer).
Click to expand...
Click to collapse
Hi,
Thanks for the tips. Unfortunately, it seems that I have caused the entire sd card partition to be erased. That mean when I trry to fastboot my device is not recognized. Also, i cannot add anything to my xoom through usb. I have tried to flash through the external sd card, but to no avail. What do I have to do?
What does your xoom show up as when plugged into your pc APX? Can you boot into fastboot mode. with power off press power and volume down until you see fastboot.
dfib1 said:
What does your xoom show up as when plugged into your pc APX? Can you boot into fastboot mode. with power off press power and volume down until you see fastboot.
Click to expand...
Click to collapse
Hi thanks for the reply to my message.
Unfortunately I cannot find my device when it is plugged into my computer (PC). It does not show up on my computer nor in the device manager. I can start the fastboot protocol on my device by rebooting, but I also cannot find my device in ADB.
Thanks for the reply, but I am still very stuck.
are you sure your device is in fastboot ? did you reinstall the drivers, try with another usb cable, adb shoud see the device after the drivers were installed correctly ...
Sent from my MZ601 using xda app-developers app
ndanl said:
are you sure your device is in fastboot ? did you reinstall the drivers, try with another usb cable, adb shoud see the device after the drivers were installed correctly ...
Sent from my MZ601 using xda app-developers app
Click to expand...
Click to collapse
I did everything I have done before. I have setup android sdk, java, and motorola drivers on two different PCs. Both fail to find my device when i type ADB devices nor does ADB reboot bootloader work. I tried the different cable, but that also did not work.
Hi,
I see that your problem is quite hard, try doing this:
1 - Force your tablet to shut down (vol+ + Power)
2 - Turn on while holding the vol- button
3 - Keep pressing vol-
4 - Plug on your PC and try fastboot devices, adb won't work!
5 - If 4 didn't work, keep trying until it does
6 - Install a Stock ROM (so you will solve your problems)
If the above don't work, contact me via PM, so we can talk easily (maybe GTalk or something like this). Good Luck
~XxLordxX
"This Story Ends Where It Began" - Octavarium (Dream Theater)
XxLordxX thank you!!!
I took your advice and just used fastboot. Then I flashed the stock rom I wanted to use. My xoom is back up and running. I really appreciate the tip.
Also thank you to everyone that responded in the post, again, that is why I love coming here.
demunted said:
Pretty impossible to brick XOOM's but i'll ask the basics. Can you get into recovery from a cold boot? Can you get into fastboot from a cold boot?
By the sounds of it you've just corrupted your rom or tried to re-unlock the device which would cause the entire sdcard partition to be erased.
Boot XOOM into Recovery, Fastboot, or RSD mode
So you need to get into Recovery to backup your XOOM (you do nandroid don't you?). Or perhaps you were working on creating new levels of awesome and something happend and you find yourself staring at the Motorola Dual Core boot screen with your XOOM refusing to boot any further. Fear not, you are only a few clicks away from finding your way back into recovery or fastboot goodness.
Turn your XOOM off
Press Power to turn your XOOM back on
When the Motorola Dual Core boot screen appears tap Volume Down repeatedly until "Android Recovery" is displayed
Press Volume Up to enter Recovery
You can also choose from Fastboot protocol support and RSD mode by using the same method but instead selecting their respective menu prompts.
Note:
If your XOOM is caught in bootloops or you find yourself stuck in RSD mode or Fastboot Protocol support you can hardware reboot your XOOM by pressing and holding Volume Up + Power until the tablet reboots (usually a few seconds but could be longer).
Click to expand...
Click to collapse
I have this problem now but I don't know what to do. Please help me out
Hey guys - I hope you're doing well.
I recently got an HTC U12+, but wanted to try using a custom ROM due to all of the bloatware . Unfortunately I think I've ended up bricking my device. Here are some things I've since tried:
- Restoring to the backup I made beforehand in TWRP - restore works without any errors, but then just hangs at the boot screen
- Method 1 from this thread (https://forum.xda-developers.com/u12-plus/how-to/collection-htcu-u12-ruu-firmware-t3794664) - TWRP always says the zip files are corrupted for some reason
- Method 3 from that same thread - this actually worked before, but I tried installing a custom ROM again, somehow messed up again, and now this method no longer works as it just hangs at the "HTC" boot screen for eternity
- Both methods in this thread (https://www.theandroidsoul.com/how-to-install-htc-firmware-ruu-and-zip/) - the first one leads to a "failed remote 99 ru unknown fail terrible mishap" error, and for some reason my PC doesn't see my phone when I try the second despite being able to see it in file manager
- Probably many other methods that I've now forgotten
I know this is a whole lot of information, but I'm in desperate need of some help. I typically like to troubleshoot things myself, but I've been trying to fix this for quite some time now and could definitely use another set of (much more experienced) eyes. I greatly appreciate any help you guys can provide.
Thanks.
Flash RUU with SD card method
Download RUU from here(important:check your CID): https://docs.google.com/spreadsheets/d/1wIRrVQawd5rD-t9VKPQ-SdRK20RcJVZhwD7lhmPIK8w/edit#gid=0
1. rename RUU to 2Q55IMG.zip
2. copy zip in the root of your sd card. - external card / not internal - it will not work
3. reboot to download mode,
4. your device will pick up the zip file and flash it.
5.follow on screen instructions and enjoy your RUU(this method erase all your data)
I'm having an issue with my u12+ where it just continually reboots to a message saying "The boot loader is unlocked and the software integrity cannot be guaranteed. Any data stored on the device maybe available to attackers, do not store sensitive data on this device" and then it shows the white HTC logo that says Powered by Android down the bottom of the screen, it stays like that for about 5 minutes and then reboots and does the same thing over again.
Holding the power down button does nothing, it will not turn off the phone. Holding power and volume down does nothing either. The phone just does this every 6 minutes and reboots and cycle and that's it.
I've tried putting the file 2Q55IMG_IMAGINE_DUGL_O80_SENSE10GP_hTC_Asia_TW_1.53.709.1_Radio_sdm845-000201b-1807311356_release_531499_signed_2_4.zip (renamed to 2Q55IMG.zip) on the root of a 8gb Fat32 formatted SD card, but I just can't get into recovery or download mode.
I've tried holding down all 3 side buttons for minutes, or just the power button, or combination of buttons, they all do nothing to the phone. (it's as tho they are disabled, but sometimes holding a combination of the 3 will make the phone vibrate a little bit, but in no particular time or order)
When the phone is in either state (locked bootloader message or white HTC logo) my Windows 10 PC sees the phone plugged in as a "USB Input Device", not an Android Phone or Android Device. So using ADB or Fastboot commands do not work to it. I've tried to force the driver to the HTC driver but that does not work.
I also tried using the RUU_IMAGINE_UHL_O80_SENSE10GP_NA_Gen_Unlock_1.30.617.2.exe file, but once again it doesn't detect my phone.
Any help would be kindly appreciated.
Cheers!
EDIT: So I was finally able to get into download mode by waiting until the phone done its 6 minute reboot and then holding power down until it vibrated once, then held volume up until it vibrated again, then let go of the power button, I was then able to choose recovery, download etc.
So I managed to get the file 2Q55IMG.zip to install, it said it installed 100% okay. The phone rebooted and now I'm stuck again just at the white HTC logo and Power by Android down the bottom of the screen.
This time the phone is not automatically rebooting itself and no key combinations will make it reboot. I've tried holding them all in certain combinations for periods of time, the phone will not reboot or turn off.
EDIT 2: So maybe I didn't wait long enough after installing the 2Q55IMG.zip file, I finally got the phone to reboot and now I've got a working phone again. happy days :laugh:
whowhatwhen said:
I'm having an issue with my u12+ where it just continually reboots to a message saying "The boot loader is unlocked and the software integrity cannot be guaranteed. Any data stored on the device maybe available to attackers, do not store sensitive data on this device" and then it shows the white HTC logo that says Powered by Android down the bottom of the screen, it stays like that for about 5 minutes and then reboots and does the same thing over again.
Holding the power down button does nothing, it will not turn off the phone. Holding power and volume down does nothing either. The phone just does this every 6 minutes and reboots and cycle and that's it.
I've tried putting the file 2Q55IMG_IMAGINE_DUGL_O80_SENSE10GP_hTC_Asia_TW_1.53.709.1_Radio_sdm845-000201b-1807311356_release_531499_signed_2_4.zip (renamed to 2Q55IMG.zip) on the root of a 8gb Fat32 formatted SD card, but I just can't get into recovery or download mode.
I've tried holding down all 3 side buttons for minutes, or just the power button, or combination of buttons, they all do nothing to the phone. (it's as tho they are disabled, but sometimes holding a combination of the 3 will make the phone vibrate a little bit, but in no particular time or order)
When the phone is in either state (locked bootloader message or white HTC logo) my Windows 10 PC sees the phone plugged in as a "USB Input Device", not an Android Phone or Android Device. So using ADB or Fastboot commands do not work to it. I've tried to force the driver to the HTC driver but that does not work.
I also tried using the RUU_IMAGINE_UHL_O80_SENSE10GP_NA_Gen_Unlock_1.30.617.2.exe file, but once again it doesn't detect my phone.
Any help would be kindly appreciated.
Cheers!
Click to expand...
Click to collapse
with the phone off, turn it on,when you feel first vibration
quick release power key and keep push volume down.
Smartphone should boot in bootloader mode.
can you get into this mode with this guide?
fabrizio b92 said:
with the phone off, turn it on,when you feel first vibration
quick release power key and keep push volume down.
Smartphone should boot in bootloader mode.
can you get into this mode with this guide?
Click to expand...
Click to collapse
Cheer mates, issue sorted. I just updated my comment in my post.
Not sure if I'm game enough again now to try and put LeeDrOiD and Magisk on it.
I use this forums a lot for info but in this case i can't find any leads of whee to go with this, so wondering if someone can chip in some ideas?
I flashed a ROM via flashtool but wasn't happy with it, so i thought i'd just go back to stock and so used flash tool AKA emma to flash one of the options given there.
First attempt to flash it said "flash failed" or something like that and had the "flashing failed, connect to computer" note in the phone when booting it. (I'm sort of making up the terms, not that much into the tech ). Anyway, i tried flashing the same FW again and this time it went through really quick being 'completed' in a few seconds.
Now when i try to boot it gets stuck in the 'Sony' logo. Can go into Fastboot but no Flash Mode (nothing happens using the vol down key), and USB debugging seems to be off now as well.
Emma only works in Flashmode so can't do anything with that. Flashtool doesn't offer anything useful in Fastboot and Xperia Companion recognises the phone when in Fastboot but asks that i unlock the screen and enter MTP...
Any help of where i can go with this?
Thanks
P.s. While keeping buttons pressed randomly it went once into flash mode, but trying to flash a ROM with flashtool it got stuck at "reding device data" and i haven't been able to enter the mode again. Is there an alternative key press combination that i stumbled on by chance? I think i just kept vol up and power held for a while and let go at a random number of phone vibrations
Just tried: Flashed twrp via fastboot and then rebooted into recovery. Same thing. It still opens to Sony splash screen and stays there
Ok, i'm kind of talking to myself here, but mild success and something that might help someone.
Managed to get back in flash mode. Don't know if it's a fluke, unique to this phone, or how it's actually meant to work, but the sequence is:
From the freezed up splash screen, and the USB connected, press and keep pressed power+vol up (hard restart/shutdown)
You get a single vibration, if you let go here it restarts. Keep pressing
You get a triple vibration, if you let go here it shuts down. Keep pressing
You get a single vibration, if you let go here it starts in fastboot. Keep pressing
You get a second single vibration, if you let go here it starts in flash mode.
Possibly a fluke but don't want to have to try again!
Anyway, i managed to flash the last working firmware and it's all good, yet this is the unwanted one. So issue is i still need to downgrade the phone to 7.1.1