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boot: cannot load "bootflash:" in a loop and no rommon prompt

Hello,

i have recently tried to change the catos on a Catalyst 2948G-L3 and since then i have the following message in a loop :

loadprog: bad file magic number: 0x0

boot: cannot load "bootflash:"

rommon: cold reset frame @0x0000000

rommon: reading reset reason register

rommon: valid nvram config

system bootstrap, version 12.0(7)w5(15a) release software

copyright (c) 2000 by cisco systems, Inc.

rommon: initializing exceptions

rommon: initializing TLB

rommon: Initializing cache

rommon: Sizing and zeroing main memory ... 64 MBytes

rommon: Sizing non-volalite memory ... 128 KBytes

loadprog: bad file magic number: 0x0

boot: cannot load "bootflash:"

.........

I  know that the solution would be to download a new valid image from tftp  via the rommon prompt but what i dont undertand is why i cant access  the rommon prompt. It justs boots with the message above in a loop

Do you have any idea ?

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