Sorry to bump this old thread but I've put together a couple of YouTube playlists of video tutorials I've created for getting Retroleap onto Leapfrog devices
using Windows 10 rather than Linux!
I can't post links as I'm a new member here but search on YouTube as follows to find them -
Leapster Explorer (LF1000) device
(search for 'Flashing a Leapster Explorer (LF1000) device with Retroleap')
LeapPad2 and LeapsterGS Explorer (LF2000) devices
(search for 'Flashing a LeapPad2 (or LeapsterGS Explorer) with Retroleap (Retroarch) using Windows 10!')
The LF1000 version has a GMenuNX frontend and a few standalone emulators. Given the limited hardware (400Mhz ARM,64MB RAM) this seems to be a better approach than trying to run Retroarch.
The LF2000 version boots straight into Retroarch 1.7.3, and comes with a few emulators preinstalled. This is as per mac2612's comments earlier in the thread.
Anyway, hope this is of some use to anybody still interested in repurposing these devices from their now grown-up kids!!