spcomputing:
It has the stk_500_paged_write error in the middle of uploading a large sketch (Show Info modified for a Mega). Blink uploads fine. This problem seems to be around serial pocket programmers(USBasp) and Arduino as ISP.
Does my bootloader uploader upload a bootloader OK? If so, then after that are you saying the (new) bootloader fails to upload a large sketch? That sounds then like the hex codes for the bootloader might be wrong. If we replace them with the bootloader that works (like WestFW's one) then things should be OK.