Session 11 — 2026-03-23c

Field	Value
Date	2026-03-23
Phase	03a — Custom UEFI ABL
Duration	~2 h

What Happened

• Cloned Qualcomm ABL source tree: LA.UM.7.2.c25 (the SDM636 branch used by Onyx)
• Built Docker-based build environment with correct NDK/GCC toolchain
• First successful ABL compilation — v1.0 binary produced
• Signed with qtestsign -v 5 — critical: -v 3 (default) produces a hash segment silently rejected by XBL on SDM636
• Phase directory renamed: 10-custom-abl.md → 03a-custom-abl.md, TWRP phase 03 → 03b

Key Findings

qtestsign -v 5 is mandatory

SDM636 XBL requires signing version 5. The default -v 3 is accepted without error by qtestsign but the resulting ELF is silently rejected by XBL at boot — device drops straight to EDL 9008 with no diagnostic output. The tools/abl-build script enforces -v 5 automatically; never sign manually.

Artifacts

Artifact	Notes
builds/abl/abl-v1.0.elf	First compiled ABL; untested on device (EDL cable not yet arrived)

Next Step

EDL cable ordered — arrival awaited before v1.0 can be flashed and tested.