Command line return value handling

[ATAineri]

Good afternoon, dear ptitSeb! I'm using your software to use bunch of programs that flashing custom boards. There are lots of proprietal binaries that need x86, but my flasher is arm64 based. So I used box86 to try to use this binaries and it worked! But flashing crashes, when my flash script try to receive return values from the bin, that was run from box86. How can I obtain return values from bins that was run under box86?
Example:
DEV_ID = /some_x86_bin
After this DEV_ID == "" - empty string(