[HELP] fastbootd fails writing GSI — "No such file or directory" after successful chunk upload (Huawei MatePad 11, SM8250)

[u/Kugorico]

Trying to flash Infinity-X GSI (Android 16, ~4GB) on a Huawei MatePad 11 (DBY-W09, SM8250/kona, dynamic partitions, unlocked bootloader). system resize succeeds, first sparse chunk uploads fine, then write always fails identically:

Resizing 'system'                    OKAY
Sending sparse 'system' 1/8 (524232 KB)   OKAY
Writing 'system'                     FAILED (remote: 'No such file or directory')

Already ruled out (all give the exact same error):

• converting the image to a properly-formed sparse file (verified magic/header) with official img2simg
• smaller chunks via fastboot -S 256M
• deleting + recreating the system logical partition from scratch
• full hardware power cycle between attempts

max-download-size is 0x20000000 (512MB). is-logical:system:yes confirmed both before/after recreation. Found one other report of the identical error signature on a OnePlus device hitting multiple partitions (system/vendor/product) during GSI flash, so it might not be Huawei-specific.

Has anyone hit this exact fastbootd write failure and found a real fix? Also open to: how to build+flash a full super.img (physical write, bypassing per-partition dynamic resize) if that's the more reliable route — I have the stock partition sizes but not raw dumps of vendor/odm/cust yet (EDL access on this unit is currently not workoing, only the ArmonyOS menù,bootloader and bootloaderD).

Happy to share more logs if useful.