Cannot Erase FLASH ???

I'm trying to upgrade the IOS in a couple of routers I've just purchased & I get this:

System flash directory:
File Length Name/status
1 3869420 igs-i-l.111-9
[3869484 bytes used, 4519124 available, 8388608 total]

Erase flash device? [confirm]
Are you sure? [yes/no]: y
%dev_open: System flash not writable

Any ideas- Copy TFTP FLASH gives the same- not writable error...

Thanks All !!!

Phil

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