unable to boot from usb

Here is a customer who had an issue similar to what you are reporting, which is not similar to the issue of OP of this thread: https://www.axzez.com/forum/interceptor-carrier-board/c4-module-stuck-in-boot/dl-ceb77670-d4bb-4c97-b024-cb0d13e3a9c9 In this case, we had the guy send in his system, we tested it, and found that it took a really long time to get to BCM-USB-MSD (05) in the boot order, but when we gave it enough time it did eventually get to that point and did load the OS Installer on the USB flash drive. We ended up sending his system back to him with no change. At the time, we wrote this to the customer: "Further testing with different CM4 modules show that your CM4 was unique.  We believe they had a software issue on your CM4 board that we’ve now fixed since we let it cycle through until it successfully used our USB flash drive and installed our OS and updates.  There are no longer any issues with this module and it boots as expected, like all of the other CM4s.  I’ve rebooted it multiple times now, with and without the USB flash drive, and there were absolutely no issues.  My USB keyboard/mouse work perfectly and I see nothing wrong with either board."

Let's see if you just let the system run for 10 minutes if it finally makes it our OS Installer screen. The bootloader should repeat itself until it finds something to boot. If after that time it does not, we'd like for you to at least try a different CM4 module.