Once again, I missed this - Rufus just pointed out your post to me. I can't find the document explaining how to reprogram your BRCK but we can definitely write something up. I will try to be more responsive but you can also email email@example.com and get a ticket open against your issue and then some will be assigned to your issue.
@rufus I have another manufacturing document for KioKit that is similar, can you work with me to update it for BRCK?
We can post it here with the hex file so anyone with a programmer can program their BRCK.