4507R+E bootloader issue

[neonetad]

Hello, everyone.

This issue arises when the device is powered off. Consequently, upon powering it back on, it fails to boot automatically and becomes stuck in ROMmon mode, requiring manual intervention via the boot command to access the CLI.
The problem occurs when the device is unexpectedly powered off due to an electricity outage. Subsequently, it fails to power on again, which is the crux of the issue.
Upon inspection of the bootloader folder, I observed that the iOS had disappeared. I attempted to rectify this by copying it back into place, yet the issue persisted upon repetition.

Any ideas?

Need to mention other configs didn't change at all. 

[Leo Laohoo]

Post the complete output to the following commands: 

sh boot
dir

[neonetad]

show boot

BOOT variable =
CONFIG_FILE variable does not exist
BOOTLDR variable does not exist
Configuration register is 0x2102

Standby not ready to show bootvar

SW-4507-MDF#dir
Directory of bootflash:/

40565 drwx 4096 Dec 25 2017 13:07:18 +03:30 virtual-instance
89233 drwx 4096 Dec 25 2017 13:07:18 +03:30 virtual-instance-stby-sync
81123 drwx 4096 Mar 4 2024 16:10:02 +03:30 pxe
40564 -rw- 2206 Jan 13 2017 04:53:24 +03:30 FXS1947Q21W_20170113001021843.lic
40568 drwx 4096 Mar 22 2023 19:45:54 +03:30 scripts
40562 -rw- 394011072 Oct 6 2023 01:06:30 +03:30 cat4500es8-universalk9.SPA.03.11.02.E.152-7.E2.bin
40563 -rw- 46738 Oct 24 2023 13:23:10 +03:30 pnp-tech-diag-summary
40571 -rw- 223381300 Sep 28 2023 00:17:53 +03:30 cat4500es8-universal.SPA.03.08.06.E.152-4.E6.bin

1700155392 bytes total (1079431168 bytes free)
SW-4507-MDF#

[neonetad]

is there possible that the problem is come from it's hardware? 
Or something with IOS? maybe bad installation? 
Or maybe: try to copy flash file into the external memory? 

or something else? and yet, there is a way to determine the problem?

[Leo Laohoo]

---

@neonetad wrote:

BOOT variable =
Configuration register is 0x2102

---

That is because there is no valid boot variable statement. 

As a test, change the config-registry to 0x2101 and reboot.  The switch should be able to boot the first valid firmware it sees.