So, i wasn't able to install the original eea fastboot rom. My solution was, that first i changed the twrp to an older one: recovery-TWRP-3.4.2B-1206-REDMI_K30PRO-CN-wzsx150.img Formatted with this. EEA rom installed without any problems. Back to fastboot, changed to MBTWRP_21-05-2021_LMI.img...