what you'll need: Same MIX 2.x firmware family as DMG SL1. USB-A to Micro-USB + Windows PC (DFUSec), or myMIX app Bluetooth OTA.
1Identical to SL1 MIX / DMG SL1 procedure. See SL1 MIX entry.
Gotcha'Rosco DMG SL1 A' does not have a separate product page on us.rosco.com, likely refers to the DMG SL1 or an SL1 bundle/variant. The 'A' suffix may denote a specific driver accessory configuration.
GotchaFirmware and update procedure are the same as the DMG SL1 / SL1 MIX.
GotchaVerify the 'A' designation on the physical unit, if it is the SL1 SWITCH (bi-color, no MIX), it has no firmware download; if it is the full MIX variant, use MIX 2.1.3.