I would def upload the newest firmware Terry has for the JB4. Before I had my G5 ISO I remember the 6/10 firmware and the 8/21 is better in my opinion. download the hex file Terry puts on N54tech under JB4 firmware, software ect... scroll down to right under the big box that tells you what settings do what and you will see a small little hex file. Download that to your computer and save it so you know where it is. Then go into your car and with your foot off the brake, push the start button twice (a good way I use to check was to turn my headlights on and make sure they come on) Connect your laptop to your computer and connect to the JB4 interface. click FILE and UPLOAD FIRMWARE, then click OK, and then it lets you browse to what you want to load. Find the new firmware you just downloaded and double click it and then click upload. It takes about 5 minutes I would say and when its done it will say upload complete. Make sure you go to the settings page before you upload and select regular JB4 since there is alot of options out there now with the G5 and G5 ISO. After you do that and the JB4 uploads it will say UPLOAD COMPLETE! WHAAA LAAA, your done!
A/W E92 335i M-sport with JB4 G5 ISO/ E40 WEDGE PERFORMANCE BACKEND FLASH, Alpina TCU flash for AT/Switch-tronic +AR Downpipes, Stett gen 1 intake, Wagner-Tuning FMIC+RB Turbo setup/ RB PCV Valve+ Akro exhaust+60% E85/93 mix,+ HRE P40S wheels, KW coilovers, M3 sways,+BMW performance CF Mirrors, BMW Performance CF deck lid spoiler,+ CF interior trim, p3 vent boost gauge,+ LUX angel eyes (11.73@119mph on street tires) NO METH!