steps
what you'll need: USB Mini-B to PC, Renesas Flash Programmer, Windows only; file: TrueMatch_RDM_V6_00_CEL4.srec
1Download and unzip KinoFlo_RFP_V3.zip from https://kinoflo.com/true-match/
2Run Renesas_Flash_Programmer_Package_V31600.exe to install (one-time only)
3Open TrueMatch6/TrueMatch6.rpj; select TrueMatch_RDM_V6_00_CEL4.srec via Add/Remove Files
4Unplug AC power; plug USB-A into PC
5Press and hold Preset 1 + Preset 2 simultaneously on the controller
6While holding buttons, plug USB Mini-B into Data port
7Release buttons; click Start; wait for 'Operation Completed'
8Unplug USB, reconnect AC, press MENU to verify version
WarningDo NOT connect AC power during flash, USB powers the unit GotchaCEL4 covers both Celeb 450 and Celeb 450Q variants GotchaMust enter bootloader by holding Preset 1+2 before USB Mini-B is connected GotchaFX mode removed in v6.0