Lpc2000

Hi I have a board with LPC2132 MCU . ISP Version 2.2.2. works fine 
at all speeds . When I switch on the same board to LPC2138 ( same
crystal 14.7456MHz , same board ) I am having download file problems .
Switching back and to LPC2132 works fine . After putting LPC2138 ( 
different piece of chip ) on again it has similar download problems ( 
even at slow speed like 9600,4800 ) . Only difference I can see is 
Bootloader ID . Which is on LPC2132 2.0 and on LPC2138 2.11 .
IS this problem in Flash Utility or in LPC2138 ?
Thanks for suggestions.
Radim