First download the new version you want to run. hr11c2 is the lastest out at this time. After you download that file extract the files from the zipped folder. Locate these files and open the folder. The folder should be named whichever version you downloaded. Find the file "msns-extra" not the s19 file. Right click on this file and copy it. Now go find your Megatune2.25 folder, then open mtCfg and paste the msns-extra file in here. You can overwright the file that is already in there or rename it if you might switch back to that firmware later. Once the new file is pasted in that fold go ahead and rename it to "msns-extra.ini.hr11c2" or whatever firmware you are using. Now open megatune and go into the configuration settings. Under megatune2.25 find your new file you put in megatune. Highlight this file and now go under file and click activate. Now go back the new firmware folder and burn the new firmware to MS. That is pretty straight forward so I wont go over that. Hope this helps some of you guys out.

98 Eclipse GS Turbo
Built motor - MS2 - Holset hy35 - Zoom Stg 4 Clutch - 57.5mm TB - ARP Headstuds - Turbonetics wastegate - 3" Turbo back - FMIC - Greddy RZ BOV - Walbro 255 - 650cc Injectors - Fidanza Flywheel - Cobra calipers w/ 13" Rotors - Oil Cooler - DevilsOwn meth injection

1981 Chevy Scottsdale
1987 Nissan 300zx - Chump Car
2001 BMW 325i