Help pleas! Android headunit wont boot up after RST - Android Q&A, Help & Troubleshooting

Hi there i have a android headunit fitted in my Car and today it wouldnt boot up (just a black screen) i tried a reset ny pushing a pin in the rest button. It got it into recovery mode but now it comes up with failed to mount external sd card [none found]? Im not familiar with android and dont know what to do
If anyone has any ideas please let me know
My first post so not sure if in right section
Thanks in advance

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[Q] [Help me] T110 Bricked (samsung tab 3 lite)

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phone didn't boot after full wipe

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Up !
Did u have solve the issue ?

Lenovo A5500-H tablet stuck in boot loop. Recovery not working.

Hey guys, I'm posting here after the kind instructions of one of your colleagues. know that this must have been brought up again by others but no matter how I tried, I wasn't able to find a working solution. If there is already a link with a proposed solution, please post it as an answer so I can follow it.
Anyway, I messed up with my Lenovo A5500-H tablet and I absolutely screwed it...
I downloaded a firmware upgrade and changed the name of a boot.img.p file to boot.img, flashed it to my tablet, rebooted and, voila! It is now stuck in an endless rebooting... Recovery mode does not work and I can find no other working key combination (apart from Power+Volume up which brings me to the "Recovery Mode" / "Fastboot Mode" / "Normal Mode" selection-none of which works).
I have googled it A LOT and I have come to the conclusion that the only possible solution could be to make a bootable SD card, so as for the tablet to boot correctly.
What I am asking for is for the right bootable file / image for my Lenovo A5500-H tablet. I know I had it coming but now it's done and I'm desperately looking for a solution. So, if anyone can help, please do! I would be grateful! Thank you in advance.
Solved!
Hey, everyone! The problem was solved right here, in your forums! Thanks for anyone wo bothered!
http://forum.xda-developers.com/android/general/lenovo-a8-5500-hv-a8-5500-h-roms-t2836866?nocache=1
felix_ret said:
Hey guys, I'm posting here after the kind instructions of one of your colleagues. know that this must have been brought up again by others but no matter how I tried, I wasn't able to find a working solution. If there is already a link with a proposed solution, please post it as an answer so I can follow it.
Anyway, I messed up with my Lenovo A5500-H tablet and I absolutely screwed it...
I downloaded a firmware upgrade and changed the name of a boot.img.p file to boot.img, flashed it to my tablet, rebooted and, voila! It is now stuck in an endless rebooting... Recovery mode does not work and I can find no other working key combination (apart from Power+Volume up which brings me to the "Recovery Mode" / "Fastboot Mode" / "Normal Mode" selection-none of which works).
I have googled it A LOT and I have come to the conclusion that the only possible solution could be to make a bootable SD card, so as for the tablet to boot correctly.
What I am asking for is for the right bootable file / image for my Lenovo A5500-H tablet. I know I had it coming but now it's done and I'm desperately looking for a solution. So, if anyone can help, please do! I would be grateful! Thank you in advance.
Click to expand...
Click to collapse
I tried to flash a custom rom that was incompatible with the device (not really sure what I was doing) and of course the outcome was a hard brick. Can you help me, on doing what you did to unbrick my lenovo a5500-h, since I have no expertise on bootable sd cards ? (please include links if you do)

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