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Hello!
Sorry if it's not clear - I use an online translator. Yes, I acted rashly.
I have such a problem:
I tried to update the firmware according to this instruction.
After turning on the printer with the inserted USB flash drive, on which the firmware is installed, several signals were heard.
The display lights up and there is nothing on it, the fans are working, the backlight is working, nothing else is happening.
The printer was manually turned off and on several times with and without a USB drive.

Please someone help to restore the firmware. The native version is probably 4... (I don't remember). Now, when I insert the flash drive, I see that attempts are being made to read from it - the indicator is flashing. And no more ...

I wrote to technical support twice, more than one week has passed - they are silent.

maybe someone has old firmware versions?