qfuse   2

FireTV 1 (bueller) Prerooted Stock Images [5.2.1.1_r1] - Post #312
Yes and no. I was able to get it to start booting, but unfortunately I had forgotten to copy a signed kernel, so it is bricked pretty hard now. Maybe one day someone will figure out how to write the mmc, and then i'll be able to write a good kernel to it. But unfortunately, it will never be able to get updated.

From what I can tell, they did 2 things. First, they added an extra service to the kernel ramdisk that blows an efuse which prevents the old bootloader from working. Second, they modified the bootchain to use that fuse (or maybe a second, I'm not sure) to prevent downgrades. So once a box gets 51.1.4.1 stock, it can never be downgraded. But it's going to be tricky from now on. So I'll have to be more careful.
firetv  bootloader  unlock  brick  efuse  qfuse  rbox  xda 
october 2016 by bfritz

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