You may have also forgotten another line, I can't remember exactly if it's
required - I haven't used it in a while.  Try this:

                bsf     STATUS, RP0     ; select Bank1 for EECON access
                bcf     INTCON, GIE     ; disable interrupts temporarily
                bsf     EECON1, WREN    ; enable EEPROM write
                movlw   0x55
                movwf   EECON2
                movlw   0xAA
                movwf   EECON2
                bsf     EECON1, WR      ; write values to EE
                bsf     INTCON, GIE     ; reenable interrupts
                bcf     EECON1, WREN    ; disable EEPROM write
Waitforflag
                btfss   EECON1, EEIF    ; poll flag bit
                goto    Waitforflag
                bcf     EECON1, EEIF    ; write cycle complete
                bcf     STATUS, RP0     ; leave Bank0 active by default
                return

--Andrew
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