Android Tablet Refuse to Enter Recovery Mode One of my Tablet(ET-86V2G-A23) refuse to enter recovery mode. I did long press volume up and power switch together and nothing happens and I also tried holding down volume up, plugging in USB cable to PC, tap power switch up to 10 times and then release volume up. That didn't work too. I want to flash the Tablet because it stops at boot flash screen. Are there any other method to force it to boot mode?

I also figure out that kernel version in system/bin/sh keeps failing.

Is it possible to rewrite files in system/bin via adb using command. I think it may also solve the start up problem. I can remember the problem started after installing busybox. Seems something went wrong after installation.
I solved it by doing a firmware upgrade with phoenix flash tool. I also figured out that there is a lot of fake firmware that do not work. they are just empty .img files.