**[HELP] Mariko HAC-001-01 — BOOT0 TSEC mismatch after accidental restore, need 22.0.0 BOOT0 for repair**
**Console:** Nintendo Switch Mariko (HAC-001-01, T214)
**Modchip:** SX Core
**Current HOS (Hekate Console Info):** 22.0.0-4
**Burnt fuses:** 7
**What happened:**
Original sysNAND was 10.0.4 with SXOS. Attempted offline update via ChoiDujourNX to 19.0.0, then ran official Nintendo OTA update which successfully installed 22.0.0 and burned fuses. After that I accidentally restored an old BOOT0 backup (from 10.0.4 era) via SX Core menu, overwriting the valid 22.0.0 BOOT0 that Nintendo had written.
**Current state:**
- SYSTEM partition: 22.0.0 ✓
- BOOT0: old 10.0.4 era (wrong TSEC/TSECB firmware)
- Hekate: boots fine
- Atmosphere (latest): crashes — "A fatal error occurred when running Fusee / Abort called / lr=0x40010082"
- OFW: black screen / no boot
- Lockpick_RCM: "Missing BIS keys / keyarea_key_application_00"
**Root cause (confirmed):**
Old TSEC/TSECB firmware in BOOT0 cannot derive master keys for 22.0.0. Everything fails at key derivation stage.
**What I need:**
A BOOT0 dump from any Mariko (HAC-001-01) console on firmware 22.0.0. I only need the TSEC/TSECB sections — I understand BCT must stay console-specific. I have a PC, NxNandManager, and Hekate USB mass storage available to perform the surgery and write back.
Dumping BOOT0 takes ~2 minutes via Hekate → Tools → USB Tools → eMMC BOOT0.
If anyone is willing to share or can point me to an existing dump for this specific repair scenario, I would really appreciate it. Thanks.
**Console:** Nintendo Switch Mariko (HAC-001-01, T214)
**Modchip:** SX Core
**Current HOS (Hekate Console Info):** 22.0.0-4
**Burnt fuses:** 7
**What happened:**
Original sysNAND was 10.0.4 with SXOS. Attempted offline update via ChoiDujourNX to 19.0.0, then ran official Nintendo OTA update which successfully installed 22.0.0 and burned fuses. After that I accidentally restored an old BOOT0 backup (from 10.0.4 era) via SX Core menu, overwriting the valid 22.0.0 BOOT0 that Nintendo had written.
**Current state:**
- SYSTEM partition: 22.0.0 ✓
- BOOT0: old 10.0.4 era (wrong TSEC/TSECB firmware)
- Hekate: boots fine
- Atmosphere (latest): crashes — "A fatal error occurred when running Fusee / Abort called / lr=0x40010082"
- OFW: black screen / no boot
- Lockpick_RCM: "Missing BIS keys / keyarea_key_application_00"
**Root cause (confirmed):**
Old TSEC/TSECB firmware in BOOT0 cannot derive master keys for 22.0.0. Everything fails at key derivation stage.
**What I need:**
A BOOT0 dump from any Mariko (HAC-001-01) console on firmware 22.0.0. I only need the TSEC/TSECB sections — I understand BCT must stay console-specific. I have a PC, NxNandManager, and Hekate USB mass storage available to perform the surgery and write back.
Dumping BOOT0 takes ~2 minutes via Hekate → Tools → USB Tools → eMMC BOOT0.
If anyone is willing to share or can point me to an existing dump for this specific repair scenario, I would really appreciate it. Thanks.
