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[Q] P3100 Unlock Bootloader, FastBoot, Modes

I apologize if I have understood this all incorrectly, but kindly clarify the following for me.
What I have already done:
1. Installed CWM (ClockWorkMod) on the tablet: Galaxy Tab 2 7.0 using Odin
2. Installed the rooting zip file from external sd
3. Made a backup image on an external sd
What I need to do:
1. Flash a custom ROM onto the device from my PC using fastboot
Errors:
1. Fastboot devices returns nothing (absolutely no response... please find the attached pic)
2. Adb reboot bootloader - just reboots the OS (not in fastboot)
3. Fastboot oem unlock says waiting for device endlessly.
My Queries:
1.I have a recovery mode and download mode (aka odin mode). Is either of them the FASTBOOT mode or is fastboot something completely different. If so how to get into FASTBOOT mode??
I read I have to get a USB icon and a Fastboot mode display on screen. I do not.
2. Why is my device not showing under fastboot devices (on download mode, neither show the device.), but adb devices shows the device under recovery mode
3. Is it possible to flash a ROM using fastboot if I have CWM installed. Or does CWM disable fastboot?
4. Also does this device have a Fastboot mode at all? If yes how to get into Fastboot mode??

From what I've read here, there is no fastboot mode on the Tabs.

Balthazar B said:
From what I've read here, there is no fastboot mode on the Tabs.
Click to expand...
Click to collapse
In that case, how do I flash a custom ROM onto the device?
Thanks!

rtindru said:
In that case, how do I flash a custom ROM onto the device?
Thanks!
Click to expand...
Click to collapse
load it on your external sdcard, boot into cwm and do a fullwipe/factory reset then install the zip from sdcard. poof, rom installed
to boot into cwm, turn off the tablet.
press and hold power and volume down (the one closes to power button) once the samsung tablet logo appears let go of power and continue holding vol down until cwm appears (this can take a couple minutes)

Thanks then!
Darunion said:
load it on your external sdcard, boot into cwm and do a fullwipe/factory reset then install the zip from sdcard. poof, rom installed
to boot into cwm, turn off the tablet.
press and hold power and volume down (the one closes to power button) once the samsung tablet logo appears let go of power and continue holding vol down until cwm appears (this can take a couple minutes)
Click to expand...
Click to collapse
Well thanks for the info.

[Q] error flashing boot.img

Sup guyz, so im trying to install the cwm kernel KitKat 4.4.2 (.40). I put the boot.img file inside |android-sdk-windows\platform-tools| and opened the cmd inside that folder, typed the command and i get an error
"cannot load boot.img", now in the guide it says to turn off phone and connect usb + holding VOL-, but there is no blue led, it works only when i push VOL+ instead. Im lost once again uhh

If you're bootloader is unlocked, for flashing kernels it's volume up (+) button and connect to usb.
Sent from my D2303

vol up = fastboot mode
Vol down : flash mode

Edit,
Solved, i didn't realize i have to use the exact img name fastboot flash boot boot_kk.40.img
CWM works now, tnx for checking out the thread fellas

Yep, Android is case sensitive
Sent from my D2303

[Q] help me...for zenfone 5...

I follow the instruction, http://forum.xda-developers.com/showthread.php?t=2880211
after flash fastboot.img and revovery.img, I choose reboot fastboot..
now I cant enter fastboot mode, I press and hlod vol up and power, it turn on into normal mode.and by reboot app see usb pic... Please...

help
help

Can't boot into recovery or fastboot

I'm running LineageOS 14.1 and I'd like to update it. If I hold the Volume Up + Power button until the Mi letters come on and let go, the letters stay on for a while and then the phone just shuts down. How can I get into recovery to flash the new zips?

Using pc via fastboot interface :
Download twrp recovery.img (depend on your bootloader version)
Get into fastboot mode (I assume you already unlocked your bootloader)
Boot up your device with recovery.img instead of boot.img ('fastboot boot recovery.img' instead of 'fastboot boot boot.img')

Vadi2 said:
I'm running LineageOS 14.1 and I'd like to update it. If I hold the Volume Up + Power button until the Mi letters come on and let go, the letters stay on for a while and then the phone just shuts down. How can I get into recovery to flash the new zips?
Click to expand...
Click to collapse
Do you rooted？You can used the adb command.
" reboot recovery"

TWRP won't boot from device, only from PC.

I bought a cheap G8141 on ebay with a cracked screen and replaced the screen myself.
I unlocked its bootloader.
Then I attempted to flash twrp into its recovery with
Code:
fastboot flash recovery twrp-3.2.3-0-maple.img
using the latest twrp maple image.
It says it succeeded, but I can't actually get it to boot into TWRP using
Code:
fastboot reboot recovery
or
Code:
adb reboot recovery
or by using any of the button press combinations (hold volume up or down + power, or power on and repeatedly press volume up or volume down).
I can only boot to twrp using
Code:
fastboot boot twrp-3.2.3-0-maple.img
instead.
I did root with magisk, and I also attempted to flash twrp to recovery from within twrp after booting directly like above, but it still won't work.

make sure your device is OFF and is NOT connected to a charger.
Then, while holding VOL-, press and hold PWR, and wait till you see TWRP.
Mine wouldn't boot into TWRP if it's on a charger, or if i'm rebooting. Only from the Device Off state.

I thought I tried it without the cable in, but i tried it again and it worked.