#!/bin/bash
# B9C rollback — restore the B8F cache (857c9c30, operational since 2026-10-03: B7C + Wi-Fi AP). Needs 9008 via HW EDL (D+->GND). boot/aboot untouched.
# Deeper rollback: b8/b8f/cache/B8F-rollback.sh (B7C 14fe453a), b7/b7c/cache/B7C-rollback.sh (T4 9d3bc890).
cd ~/doc/modem/jz08-aurora || exit 1
L=firehose/007050e100000000_394a2e47cf830150_fhprg_peek.bin ; O=logs/b9/b9c/rollback ; mkdir -p $O
B=b8/b8f/cache/cache-extlinux-b8f.img
[ "$(sha256sum $B | cut -d' ' -f1)" = 857c9c300055804cab673027bc8cddc010ad04bfec5d75276d8229b84846c4b2 ] || { echo "STOP: rollback image hash"; exit 1; }
lsusb | grep -q 05c6:9008 || { echo "STOP: no 9008"; exit 1; }
edl --loader=$L printgpt > $O/00-printgpt.log 2>&1
edl --loader=$L w cache $B > $O/cache-w.log 2>&1
edl --loader=$L r cache $O/cache-rb.bin > /dev/null 2>&1 ; cmp $B $O/cache-rb.bin && echo CACHE_RESTORED_B8F
sha256sum $B $O/cache-rb.bin