A30T Firmware

[Tschaba]

Hello,
I have a question. After the flashing of the Firmware with both versions of the Geetech site (official site), the printer does not work anymore.
By the Z axis, one engine goes up and the other down. By the Y axis, nothing works. By the X axis, it works only in x-plus.
Does anyone know a firmware that works and could help me solve the problem?
Thank you in advance!
Stefan