In order to get my 3-year-old Picstart Plus to program an 18F452, I've = obtained a new 17C44 (instead of the more expensive PUM) and programmed = it with the last (v3.11) firmware upgrade, which I downloaded from = Microchip. I confirmed the 17C44 was blank beforehand, and verified its = contents after programming. After installing the new 17C44 as per = Microchip's instructions, the Picstart reports the new version when = Enable Programmer is clicked in MPLAB (v5.50), but MPLAB still reports = the old Picstart firmware version in Help...About. MPLAB also still = gives me the "Unsupported Device" error when I try to enable the = programmer with an 18F452 project open. How do I "tell" MPLAB 5.50 = (which has always listed the 18F452 as a supported device) that the = Picstart is running new firmware? I can't find this info on Microchip's = site. Sorry for the long post...just trying to be clear and thorough. Thanks, RR -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist