Open the gp88 file with hex workshop or other software change number 23 with number 14 at offset 0000000C
3133 3354 5545 3439 3230 0403 2304 0102 <-- recognized as GP88 (original)
3133 3354 5545 3439 3230 0403 1404 0102 <-- recognized as GP300
Write to the disk, finish.
Run the program, and your GP88 recognized/detected as GP300 with features.
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