First of all many thanks for this post, it has helped me a lot during the battle I still have with this Chinese unit acquired in 2014.
I have tested all firmware´s mentioned in the post and all of them work but after two or three days my unit stops booting (stacked at the boot logo)
Only option is to flash the firmware again so I can survive for 2 more days.
Does any of you know how to get boot log or see the boot process (instead of the Android Logo) to identify what is causing the stack?.
Many thanks in advance for your advice.