#!/bin/bash
# R2/T4 rollback — restore the B6P cache (9fea693a, operational since 2026-10-01). Needs 9008 via HW EDL (D+->GND). boot/aboot untouched.
# Deeper rollback: b6p/B6P-rollback.sh (B5b golden mm1, 409bbb11).
cd ~/doc/modem/jz08-aurora || exit 1
L=firehose/007050e100000000_394a2e47cf830150_fhprg_peek.bin ; O=logs/r2/t4/rollback ; mkdir -p $O
B=b6p/cache-extlinux-b6p.img
[ "$(sha256sum $B | cut -d' ' -f1)" = 9fea693a436b49ca56aed0857725ecdde8a0071700cf5d23b02dab9d9ff406b7 ] || { echo "STOP: rollback image hash"; exit 1; }
lsusb | grep -q 05c6:9008 || { echo "STOP: no 9008"; exit 1; }
edl --loader=$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_B6P
sha256sum $B $O/cache-rb.bin