I'm having the exact same issue (Flash erase error) with Dell U2722DE - M3T104 firmware update from M3T101. I have also tried unplugging/re-plugging, turning on/off the monitor, and still unsuccessful. I also tried using different ports (USB-C, DP and HDMI) with two different Windows 10 laptops and all were unsuccessful. Attached below are the logs:

• https://pastebin.com/4hswr4mC
• https://pastebin.com/e0tYw2ZY 

Would appreciate any suggestions as well, thanks!

KSunday, like aerotop, upload the log files and provide the links. The U2722DE firmware update log file is found at = C:\Dell\firmware\U2722DE\log

Here you go Chris,

https://pastebin.com/667RNnjE

We have sent the log to the Displays Team. Awaiting their reply.

Thanks Chris,

I just tried again using the USB-C with display on (previously I was using a USB-A->USB-C upstream cable). Same error messages with this too.

Looking forward to seeing what the team come back with.

2021-10-11 21:36:25.372 ( 91.448s) 1| Plugins Manager: Update PDC success => 0:01:22:988:730
2021-10-11 21:36:25.372 ( 91.448s) 1| Plugins Manager: Update DISPLAY
2021-10-11 21:36:25.372 ( 91.449s) ERR| Plugins Manager: error: no parent node.
2021-10-11 21:36:25.911 ( 91.987s) 1| MNT VER. => M3T101
2021-10-11 21:36:27.720 ( 93.796s) 1| MNT ISPTAG => #CHK#M3T104#
2021-10-11 21:36:27.720 ( 93.797s) 1| Updating => stage: [0]
2021-10-11 21:36:27.725 ( 93.801s) 1| Updating => stage: [1]
2021-10-11 21:36:27.725 ( 93.801s) 1| [4][-1]
2021-10-11 21:36:27.798 ( 93.874s) 1| Updating => stage: [2]
2021-10-11 21:36:27.862 ( 93.938s) 1| Updating => stage: [3]
2021-10-11 21:36:28.115 ( 94.191s) WARN| stage [3] => functional error (0xFFFFFFFF, block: 63, cnt: 3)
2021-10-11 21:36:28.346 ( 94.423s) WARN| stage [3] => functional error (0xFFFFFFFF, block: 63, cnt: 2)
2021-10-11 21:36:28.616 ( 94.693s) WARN| stage [3] => functional error (0xFFFFFFFF, block: 63, cnt: 1)
2021-10-11 21:36:28.617 ( 94.693s) 1| [4][2] Flash erase error. See Help for step by step instructions to retry update.
2021-10-11 21:36:28.647 ( 94.723s) 1| Close => terminated.
2021-10-11 21:36:28.647 ( 94.724s) 1| Close => terminated.
2021-10-11 21:36:28.648 ( 94.724s) ERR| Plugins Manager: error: Display update failed.
2021-10-11 21:36:28.648 ( 94.724s) 1| Plugins Manager: Update elapsed => 0:01:27:299:727
2021-10-11 21:36:28.648 ( 94.724s) 1| *** MULTI-MNT *** reset index 0
2021-10-11 21:36:28.648 ( 94.725s) 1| Plugins Manager: Reset (index 0)
2021-10-11 21:36:28.648 ( 94.725s) 1| Plugins Manager: Cannot find parent node.
2021-10-11 21:36:28.648 ( 94.725s) 1| Plugins Manager: Reset DISPLAY
2021-10-11 21:36:28.649 ( 94.725s) ERR| Plugins Manager: error: no parent node.
2021-10-11 21:36:29.465 ( 95.542s) 1| Reset => result (0x00)
2021-10-11 21:36:29.466 ( 95.542s) 1| Close => terminated.
2021-10-11 21:36:29.466 ( 95.542s) 1| Close => terminated.
2021-10-11 21:36:29.466 ( 95.543s) 1| Plugins Manager: Reset elapsed => 0:00:00:817:989
2021-10-11 21:36:29.504 ( 95.580s) INFO| NewFWInfo: (mcu:version, per line)
2021-10-11 21:36:29.504 ( 95.580s) INFO| U2722DE:M3T104
2021-10-11 21:36:29.504 ( 95.580s) INFO| PDC:f807.12.8.0000000200000002
2021-10-11 21:36:29.504 ( 95.581s) INFO| DISPLAY:M3T104
2021-10-11 21:36:29.505 ( 95.581s) INFO| OldFWInfo:
2021-10-11 21:36:29.505 ( 95.581s) INFO| U2722DE:M3T101
2021-10-11 21:36:29.505 ( 95.581s) INFO| PDC:f807.12.12.0000000500000005
2021-10-11 21:36:29.505 ( 95.581s) INFO| DISPLAY:M3T101
2021-10-11 21:36:29.505 ( 95.581s) INFO| UpdateResult: Fail
2021-10-11 21:36:29.505 ( 95.581s) INFO| ScalarRebootResult: Pass

I have two U2722DEs, one running firmware M3T102 DE and one M3T101. I was successful in updating to M3T104 from M3T102 but not M3T101. It looks like Dell needs to release a firmware upgrade that would allow a monitor to be updated from M3T101. 

That’s really good feedback. Thank you!

I don’t mind updating to M3T102 first but I can’t find that version of the firmware online. 

Thank you for feedback!

Would appreciate if Dell Display team could release the firmware upgrade to M3T102, Chris?

I had the same problem too - tried to update the firmware to the newest one using a Windows-Laptop instead of my MacAir M1 2020. Have you ever heard about problems connected to the Dell U2722DE and the MacBook Air? I have no chance to connect even the ethernet via the Usb-c to Usb-C connection. Any clues?