Wow, what a unfriendly clone!
Do you another untouched board? If yes connect via serial and press reset to figure out how it was flashed.
?nd boot version : 1.?
SPI Speed : ?
SPI Mode : ?
SPI Flash Size & Map: ?
jump to run user1 @ 1000
Use this information to tame it .
Start with erase_flash and than with write_flash.
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