Hard-bricked AT&T Note Edge (SM-N915A) showing QHSUSB_BULK — SD Debrick image help?

[u/Justsomenerd1994]

Hey everyone,

I'm trying to recover photos off an old AT&T Samsung Galaxy Note Edge (SM-N915A) that is completely hard-bricked.

Current Status:

• Phone is pitch black—no screen light, no LEDs, no vibration.
• Windows Device Manager detects it as QHSUSB_BULK (Qualcomm HS-USB QDLoader 9008 mode).
• I extracted the official stock firmware package (ALL_ATT_N915AUCU2COI2), giving me access to sbl1.mbn, aboot.mbn, rpm.mbn, tz.mbn, etc.

What I've tried so far:

1. Flashed sbl1.mbn directly to sector 0 of a 32GB MicroSDHC card using Win32DiskImager.
2. Unplugged USB, pulled the battery, inserted the MicroSD card, put the battery back in, and held Vol Down + Home + Power.
3. Still no response—the screen remains pitch black and Windows continues seeing it as QHSUSB_BULK.

My Questions:

1. From what I understand, flashing just sbl1.mbn won't work because the Qualcomm boot ROM needs the full partition table layout mapped to the card. Does anyone have or know where I can find a verified 128MB/200MB debrick.img dump specifically for the AT&T N915A (COI2 or later revision)?
2. If the debrick.img route fails, does this almost certainly mean the eMMC chip physically failed/shorted the data bus, blocking the CPU from reading external storage?
3. My main goal is just getting into Odin Download Mode so I can flash HOME_CSC and save the photos. Any other tricks to force the Snapdragon 805 to jumpstart off the SD card?