I made some progress using the following loader:
https://github.com/bkerler/Loaders/b...1d8a_fhprg.bin, but only on Linux and with B. Kerler's Python EDL. I'm now able to read the boot_a partition, patch the boot.img with Magisk, and (supposedly) write it back to boot_a (see log below). However, after rebooting, Magisk doesn't seem to be installed when I launch it (Installed: N/A). This could mean either the flashing didn't work despite the log, the boot_a partition is restored on reboot, or perhaps Magisk doesn't support the latest version of the device/Android/kernel. Has anyone had full success using a different tool or flashing process?
python edl --loader=goco7_gen2.bin --memory=emmc w boot_a magisk_patched-29000_BWlbI.img edl 11:08:52
Qualcomm Sahara / Firehose Client V3.62 (c) B.Kerler 2018-2025.
main - Using loader goco7_gen2.bin ...
main - Waiting for the device
main - Device detected 
sahara - Protocol version: 2, Version supported: 1
main - Mode detected: sahara
sahara -
Version 0x2
------------------------
HWID: 0x0013f0e100000000 (MSM_ID:0x0013f0e1,OEM_ID:0x0000,MODEL_ID:0x0000)
CPU detected: "bitra_SDM"
PK_HASH: 0xd40eee56f3194665574109a39267724ae7944134cd53cb76 7e293d3c40497955bc8a4519ff992b031fadc6355015ac87
Serial: 0x3c424cad
sahara - Protocol version: 2, Version supported: 1
sahara - Uploading loader goco7_gen2.bin ...
sahara - 64-Bit mode detected.
sahara - Firehose mode detected, uploading...
sahara - Loader successfully uploaded.
main - Trying to connect to firehose loader ...
firehose - INFO: Binary build date: Aug 21 2020 @ 09:02:30
firehose - INFO: Binary build date: Aug 21 2020 @ 09:02:30
firehose - INFO: Chip serial num: 1010977965 (0x3c424cad)
firehose - INFO: Supported Functions (17):
firehose - INFO: program
firehose - INFO: read
firehose - INFO: nop
firehose - INFO: patch
firehose - INFO: configure
firehose - INFO: setbootablestoragedrive
firehose - INFO: erase
firehose - INFO: power
firehose - INFO: firmwarewrite
firehose - INFO: getstorageinfo
firehose - INFO: benchmark
firehose - INFO: emmc
firehose - INFO: ufs
firehose - INFO: fixgpt
firehose - INFO: getsha256digest
firehose - INFO: getvar
firehose - INFO: dump
firehose - INFO: End of supported functions 17
firehose
firehose - [LIB]: Couldn't detect MaxPayloadSizeFromTargetinBytes
firehose
firehose - [LIB]: Couldn't detect TargetName
firehose - TargetName=Unknown
firehose - MemoryName=eMMC
firehose - Version=1
firehose - Trying to read first storage sector...
firehose - Running configure...
firehose - Storage report:
firehose - total_blocks:122126336
firehose - block_size:512
firehose - page_size:512
firehose - num_physical:4
firehose - manufacturer_id:223
firehose - serial_num:3161457158
firehose - fw_version:48734822444564496
firehose - mem_type:eMMC
firehose - prod_name:SCA64G
firehose_client - Supported functions:
-----------------
program,read,nop,patch,configure,setbootablestorag edrive,erase,power,firmwarewrite,getstorageinfo,be nchmark,emmc,ufs,fixgpt,getsha256digest,getvar,dum p
modules
modules - [LIB]: 'Logger' object has no attribute 'loglevel'
firehose -
Writing to physical partition 0, sector 1311744, sectors 196608
Progress: |██████████| 100.0% Write (Sector 0x30000 of 0x30000, ) 111.20 MB/s
Wrote magisk_patched-29000_BWlbI.img to sector 1311744.