# B7C c5 — **class-A cold boot #1: PASS**
Power-off ≥ 90 s (operator); one attempt, fastboot caught first time. SBL1 16:23:05 UTC, `fastboot boot` rc=0, RTC at boot 6 s → class A (PMIC POR).
(Off-time not measurable from UART: the running B7C Linux printed nothing between logger start 16:16:22 and power-off; RTC 6 s proves the POR.)
Probes: 1-4 INVALID (DMS 3221…7179 ms = modem uptime), 5 INVALID with bogus NITZ 1980-01-06 00:00:13 (rejected by year gate),
6 REG registered/attached VALID (NITZ 16:23:37, Δ +0.76 s) → **TIME SET at uptime 27.46 s** (33 → 2026-10-02 16:23:38), 7-8 VALID, no re-set.
START OK 78.8 s, Beeline home, LTE ping 3/3. SNTP check +0.041 s (best, ntp3, 50 ms RTT); verify ntp2 +0.048…+0.055 s. Clock kept.
UNSYNC kept, RTC untouched, eMMC writes 0, dmesg-errs 0, no FAIL/rollback.