Repair genuine skyrc IMAX b6 AC V2

[nnannos]

Hi, i have the SkyRC imaxB6AC V2 and due to faulty usb cable had blew it off.
But I managed to replace the TD1534, the 78M05  the mcu MA84G564AD48 and LCD Screen.
I also managed to connect it with USB and by connecting GND to SDA signal and reseting it put the firmware upgrade Β6ACV2_V1.13
After that the charger boots but stays at first logo screen which says SKYRC IMAX-B6AC and nothing happens, no beep no battery menu.
Nothing else in circuit is at fault, can you please tell me why not working?
Do i need other firmware to install or mcu needs more info to load???
I bought the MA84G564AD48 on ebay and i have tested 2 chips with same result.

Thank you in advance

[dvd4me]

Hello,
I just figured out why it's stuck, it's missing the calibration or some data in the boot sequence.
It runs with the Turnigy 80W fw  (1.13 Skyrc modified clone) but I cannot enter the calibration.
See my post for more details. https://www.eevblog.com/forum/repair/repair-genuine-imax-b6-mini-v2/

Regards