Flash failed comma four

## Bug Report - flash.comma.ai

**Device:** comma four
**Serial:** 968e04d6
**Error:** FLASH_SYSTEM_FAILED
**Step:** FLASH_SYSTEM
**Last Message:** Flashing system_a

**OS:** macOS 10.15.7
**Sandbox:** None detected
**Browser:** Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36
**URL:** https://flash.comma.ai/
**Time:** 2026-08-23T02:41:24.616Z

Console Logs

```
[2026-08-23T02:19:56.908Z] [info] [Flash] Downloading splash
[2026-08-23T02:19:56.909Z] [debug] [ImageManager] Downloading splash from https://commadist.azureedge.net/agnosupdate/splash-5c61260048f22ede6e6343fabb27f6ff73f9271f4751a01aaf7abf097afc1f08.img.xz
[2026-08-23T02:19:57.243Z] [info] [Flash] Flashing splash
[2026-08-23T02:19:57.284Z] [info] [qdl] Flashing splash
[2026-08-23T02:19:58.730Z] [info] [Flash] Downloading storsec
[2026-08-23T02:19:58.734Z] [debug] [ImageManager] Downloading storsec from https://commadist.azureedge.net/agnosupdate/storsec-4494d86f68b125fbf2c004c824b1c6dbe71e61a65d2a1cc7db13c553edcb3fce.img.xz
[2026-08-23T02:19:58.805Z] [info] [Flash] Flashing storsec_a
[2026-08-23T02:19:58.869Z] [info] [qdl] Flashing storsec_a
[2026-08-23T02:19:58.878Z] [info] [Flash] Flashing storsec_b
[2026-08-23T02:19:58.927Z] [info] [qdl] Flashing storsec_b
[2026-08-23T02:19:58.934Z] [info] [Flash] Downloading tz
[2026-08-23T02:19:58.935Z] [debug] [ImageManager] Downloading tz from https://commadist.azureedge.net/agnosupdate/tz-e9443bf187641661bfa6c96702b9ab0156e72fb7482500f8799ba9ee2503cb16.img.xz
[2026-08-23T02:19:59.072Z] [info] [Flash] Flashing tz_a
[2026-08-23T02:19:59.107Z] [info] [qdl] Flashing tz_a
[2026-08-23T02:19:59.176Z] [info] [Flash] Flashing tz_b
[2026-08-23T02:19:59.212Z] [info] [qdl] Flashing tz_b
[2026-08-23T02:19:59.287Z] [info] [Flash] Downloading boot
[2026-08-23T02:19:59.288Z] [debug] [ImageManager] Downloading boot from https://commadist.azureedge.net/agnosupdate/boot-8806802b195a5b1396a3ae8dd92a8b7711dc522f6aceafd820e871bae5c8a6d8.img.xz
[2026-08-23T02:20:00.798Z] [info] [Flash] Flashing boot_a
[2026-08-23T02:20:00.832Z] [info] [qdl] Flashing boot_a
[2026-08-23T02:20:01.472Z] [info] [Flash] Flashing boot_b
[2026-08-23T02:20:01.538Z] [info] [qdl] Flashing boot_b
[2026-08-23T02:20:02.233Z] [info] [Flash] Downloading system
[2026-08-23T02:20:02.236Z] [debug] [ImageManager] Downloading system from https://commadist.azureedge.net/agnosupdate/system-ef0d879302cb29e72110e9c8d3f947c830fd7d37c8192744fc9dbea1af78501f.img.xz
[2026-08-23T02:21:40.969Z] [info] [Flash] Flashing system_a
[2026-08-23T02:21:40.976Z] [info] [qdl] Flashing system_a
[2026-08-23T02:24:23.426Z] [error] [Flash] An error occurred while flashing system
[2026-08-23T02:24:23.427Z] [error] {}
[2026-08-23T02:24:23.428Z] [debug] [Flash] error 7
[2026-08-23T02:24:23.428Z] [info] Flashed system in 294.86s
```

Start with the flash.comma.ai FLASH_SYSTEM flow and compare the console logs around the system_a step, where error 7 is reported after earlier partitions succeed. Reproduce the comma four flash if possible and trace the failure path; done means system_a completes or the user receives a specific, actionable error.

Written by the indexing model from the issue text.