Hi, I have the same problem and I followed your instructions but while the new firmware is installing from the sd card, the phone shut down.
It seems like it has no sufficient power to finish the operation. In fact I tried to plug the phone to charge the battery and that don't work...at least the led is not on (but I'm pretty sure it's not charging).
After that the only things I can do is to power on again and see the boot loop.
Any idea on how to solve?
My problem was that when into the original recovery, after a few seconds, phone reboots and back up to kernel logo
The full command for flash is: fastboot flash recovery recovery_original_flashable.img
I posted you fastboot noob-friendly tutorials
1st you need fastboot installed and P6 and fastboot drivers
Asumming you already have downloader the image and you are in windows, open a cmd promp and navigate (using cd command) to your fastboot directory, place recovery_original_flashable.img in this folder. If your phone is shutdown, hold vol- and plug the usb cable (if it's continuous rebooting, hold vol- and power button until phone reboots and kernel logo come up)
Type on the cmd promt: fastboot devices , if you see under devices attached, ??????????? or numbers and letters, your phone is connected into fastboot mode
If you don't have this, check if the drivers was correctly installed.
With the phone connected in fastboot mode, type in the cmd promt: fastboot flash recovery recovery_original_flashable.img
After this command finish, type fastboot reboot and enter into the default recovery and try to update the system
I not guarantee the exit of this operation, this solved my problem, but maybe yours not. If you aren't sure, ask here or send phone to your repair center
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