Originally Posted by saeid.babaei
Can you please elaborate more in details what steps should be taken starting from scratch?
I think that the device has a great potential but I'm not an expert and I would like to give it a try.
Thanks in advance
Unlock bootloader -> download the HH6 March firmware + cracked OST from the 4pda thread -> flash firmware. Let it boot, run through the setup, and update all the way to the latest OTA update (June 1st security update). Reboot into fastboot, switch the slot from B back to A (May 1st security update), and flash heineken's TWRP patched boot image from the 4pda thread. Boot into TWRP, flash the vendor partition fix from the same post as the TWRP image, and reboot.
I no longer own the device, and I have no intention on supporting it, so I will not be writing out a hand holding guide. If you have enough experience in basic Android flashing, unlocking bootloader, using fastboot, etc...., there's enough info between this post and the stickied posts on the 4pda thread for the phone for you to get it done quickly and safely, the phone is pretty stock standard Android. If you don't, well there's no support for you because the entire community for the phone is in 4pda and you likely don't speak the language, and the tools required to revert the phone back to stock is the same tools used to convert it to HH6, so if you can't get it working in the first place you're probably not fixing it either.