Looks like succeed in recovering BlueTooth in 34xx. I don't know if it will work always, but for me it worked.
I executed this batch:
xrgn,34,1:/34.bin
ergn,41
xrgn,34,1:/34.bin
Where 34.bin is region 34 backup. From offset 0x10 are not FF, but some info.
And, even startup screen shows 34xx, BT is working.
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