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thanks andy, but i eventually got it working. i really have no idea what was wrong. what i did different (which is not to say this was the problem) on the second day of attempts:
i installed the lpc2000_flash_utility - but it doesn't support lpc2148 (i'm thinking maybe it made some changes to the system)
i powered on the lpc2148 before plugging in the rs232 shifter.
tried again using flash magic (same version, same system)
that's it. worked like a charm.

Start flashing -> Operation Failed. (programming - failed to send data to the device)

Hi. I'm having the same problem with a LPC-H2148.
i can read and erase it but programming fails.
when i check security it sais "CRP is disabled"
using  "Erase all Flash+Code Rd Prot" doesn't change anything - programming fails.