# B7C c3 — INVALID (not a class-A cold boot; boot interrupted). Nothing touched on the board.
- UART: board (c2b Linux) alive until 13:38:13 (MM debug lines), first SBL1 Start 13:38:27.9 → **off ≈ 14 s**, not ≥ 90 s.
  Three SBL1 starts in 6 s (13:38:27.9, 13:38:29.1, 13:38:33.7 = fastboot entry attempts), fastboot 13:38:34.5, `fastboot boot` 10:38:35 UTC rc=0.
- Linux: RTC at boot **1277 s → class B**. EMMC-RO 30/30, /firmware mounted ro at 13:38:41.5 — **then the UART went completely silent** (logger alive, .raw stops at the same byte).
- Host: NCM never appeared; ~3 min later the board is in **lk fastboot again** (lsusb 18d1:d00d) with no UART trace of that reset → UART RX/GND
  most likely disturbed during handling, and the board was reset into fastboot again (RESET held) after 13:38:41.
- Operator: "в fastboot попал не с первой попытки, конструкция неудобная". Driver now prints the RTC-based class right after NCM comes up.