The boot variable says that the IOS image file should be searched at the following path:
flash:/c3750e-universalk9-mz.122-53.SE2/c3750e-universalk9-mz.122-53.SE2.bin
And as it seems, neither directory flash:/c3750e-universalk9-mz.122-53.SE2/ nor file c3750e-universalk9-mz.122-53.SE2.bin are there any longer.
There is no need to copy the original image back, just manually force the switch into rommon and make it load the new image. Probably, you just need to wait through a boot cycle, and it will present you with a rommon> prompt
- (if needed), force the switch into rommon with the mode button procedure. (keep the mode button pressed while power-on for ca. 30sec); the procedure is also described in various FAQs related to password recovery of 2960/3560/3750 switches.
- at the
rommon> prompt, type boot flash:/c3750e-universalk9-mz.152-4.E6.bin (because that is the location and filename of the new image uploaded to the switch)
- once booted up, go into config mode and use the
boot system flash flash:/path/file.bin (in your case: boot system flash flash:/c3750e-universalk9-mz.152-4.E6.bin) command, so that it points to the correct IOS image file.
Suggestion:
Next time, use the archive download-sw .... commands to upgrade a 3750, especially when upgrading a switch stack. Saves an immeasurable amount of time and avoids most kinds of errors that can happen, even sets the boot system flash ... commands for you.
Hint: it is very possible that when upgrading from IOS 12.2(53)SE2 to 15.2(4)E6, there will be a microcode upgrade to the ASICs. That will be taken care of automatically upon first boot of the new IOS. Depending on the number of ports (12,24,48), this might need enough time for a decent lunch break.
Disclaimer:
This of course will only work if the new IOS image file is not corrupted in any way. If that happens to be the case, you may resort to loading an IOS image via network and TFTP, or booting an IOS image from an USB stick might also work (3750X should be young enough to have an USB port and a rommon version capable of accessing USB storage)
The cable pictured is a standard: IEC320-C15. The difference is in the temperature rating of the cable. These are rated to 120C, while the "ordinary" ones (IEC320-C13) are 70C.
I believe the increased load for PoE switches requires the higher temperature rating.
Best Answer
Your process is correct, and assuming you get the same version number for all of them, you should be fine. If you're connected to the stack master, a "dir" should show flash file systems matching each switch (flash-1:, flash-2:, flash-5:).
Remember these when you're copying the files over, but I don't think you'll need them when you go to configure your boot statement - you should be able to just say "boot system switch 1 flash:", "boot system switch 2 flash:," etc.
The flash on those switches should be big enough to hold a second copy of IOS. I'd recommend retaining your current version of IOS in addition to the new version to make roll-back easy.