Neur0n has released an update to the 6.38 ME CFW. This CFW works with a PSP 1000 & 2000 till Datacode 8B.
This is what the developer had to say about 6.38 ME-2
CFW 6.38 Minimum Edition for 01g, 02g model by neur0n
-- What is this?--
This is CFW work on PSP1000 and PSP2000.
The degree of stability is still unknown.
Please test it on your own and refer to different people's test reports.
From 5.00M33