2-group Convoys - change to 1 group (permanently disable blink modes)?

A dedicated AVR programmer costs <$5 TYD and is much easier. There are several differnent links around here, start here-

AVR Drivers - Flashlight Wiki (and the whole AVR flashlightswiki: AVR Drivers - Flashlight Wiki)

http://www.jcapsolutions.com/flashlights/firmware/

there are several other stickies in the DIY subforum,

edit: there is way more information there than you’ll be able to take in, order the programmer and clip now (they’ll run you about $15 total TYD) and start reading, then in ~30 days when your stuff gets here from China you’ll have an idea what to do and be ready to follow along a tutorial and reprogram a stock 105c to something like STAR Off-Time or some other better-than-stock open source code from people like JonnyC and Dr.Jones