Boss releases GM-800 system program Ver.1.03

July 1, 2023 · 2 sources

Boss released GM-800 system program Ver.1.03 in July 2023, according to the update history on its support page¹. The update adds support for BOSS TONE STUDIO for GM-800 and improves system stability¹.

The GM-800 is a guitar and bass synth processor, listed among the maker's multi-effects pedals. The Ver.1.03 entry lists two changes: "Support for BOSS TONE STUDIO for GM-800" under additional functions and "Improved system stability" under bug fixes¹.

The update is installed from a USB flash drive. Boss says the drive "needs to be formatted on a GM-800," and the file "GM-800_UPA_up.bin" is copied to the drive's root directory¹. To start the updater, the player holds the [WRITE] button while turning the power on¹. Boss warns: "Never power-off your GM-800 while the update is in progress!"¹

The same July 2023 window brought a comparable update for another Boss unit. The ME-90 system program Ver.1.03, dated July 2023, added "Support for BOSS TONE STUDIO for ME-90" and "Support for ME-90 IR Loader," and improved system stability². That update is carried out over a USB connection to a computer rather than a flash drive².

The GM-800 page lists later versions, including Ver.1.10 in May 2024, Ver.1.20 in January 2025 and Ver.1.50 in July 2026¹.