Console Revisions Differences
The list is for devices New BittBoy and Pocket Go differences:

Note: Some people have been receiving consoles with parts of different versions, if any CFW does not work let us know in our Discord indicated above.

Rev	Release	Notes
Pocket Go 1	May 14, 2019	Changed circuit board (see here)
Pocket Go 0.5	May 10, 2019	Added shoulder buttons (L & R)
Pocket Go 0.5	May 10, 2019	Added physical volume control
Pocket Go 0.5	May 10, 2019	New landscape form factor
BittBoy 3.5	May 14, 2019	Changed circuit board (see here)
BittBoy 3.5	May 14, 2019	Barcode changed to 20190424 005 (newers no longer include it)
BittBoy 3.5	May 14, 2019	Glass screen is thinner
BittBoy 3	April 23, 2019	New non-registered key combos detected
BittBoy 3	April 23, 2019	Fixed Ghost Key issues
BittBoy 3	April 23, 2019	Added tempered glass screen
BittBoy 3	April 23, 2019	Added rumble/vibration features
BittBoy 3	April 23, 2019	Micro USB port is flush with the shell
BittBoy 3	April 23, 2019	Bigger lightning symbol on battery LED
BittBoy 3	April 23, 2019	Changed screen (Still IPS but different model)
BittBoy 3	April 23, 2019	Barcode (20190410 004) added at the rear top of the console
BittBoy 3	April 23, 2019	Processor changed to Allwinner F1C100s (Not F1C500s anymore)
BittBoy 3	April 23, 2019	Box design changed (see here)
BittBoy 3	April 23, 2019	Changed color shell (Slightly darker than the rev1)
BittBoy 2.5	March 05, 2019	Removed internal chip storage, no stock firmware
BittBoy 2.5	March 05, 2019	Only runs CFW from SD Card
BittBoy 2.5	March 05, 2019	Changed color shell to gray
BittBoy 2	Jan 10, 2019	Three display options (I: Normal, II: Pixel Perfect, III: Full)
BittBoy 2	Jan 10, 2019	Changed screen (Still IPS, removed 2nd display)
BittBoy 2	Jan 10, 2019	Clicky Start and Select buttons
BittBoy 2	Jan 10, 2019	4bit hardware
BittBoy 2	Jan 10, 2019	Changed the button scan code sequence
BittBoy 2	Jan 10, 2019	Can run Stock Firmware and Custom Firmware
BittBoy 1	Nov 30, 2018	Two display options (I: Normal, II: Full)
BittBoy 1	Nov 30, 2018	Soft Start and Select click buttons
BittBoy 1	Nov 30, 2018	Internal 2nd display (Not used)
BittBoy 1	Nov 30, 2018	1bit hardware
BittBoy 1	Nov 30, 2018	CFW requires hardware modifications