FYI, I recently did some upgrading/testing of my G40. It was the high end model that came without built in wifi (model 2388-5DU).
It turns out that the same motherboards are used in the wifi/non-wifi G40 models. So, all I needed was 1) a mini-PCI wifi adapter, 2) antennas (they do not come built-in/prewired), 3) front clear plate with wifi indicator (the LED is behind the blank are of the existing clear plate on all models).
I found a G41 cover with antennas on eBay (G40 and G41 covers are interchangeable) and I modified the existing G40 clear plate by cutting off the section without the wifi icon and adding a section from a T40 clear plate that had the wifi icon (great fit, hard to notice unless you look for the seam).
Then I started testing mini-PCI wifi adapters. I knew the Intersil B adapter and the IBM/Atheros A/B adapters would work, since those came as options, but I wanted a G adapter for faster speeds.
I found it somewhat surprising that all the other adapters I tried were prevented by the 1802 error at boot up. I tried the following adapters (I expected the older IBM/Atheros a/b/g to work since it is so simalar to the IBM/Atheros a/b, but no go);
IBM/Atheros a/b/g
IBM/Atheros a/b/g II
Intel b/g
Intel a/b/g
Luckily, the no-1802.com utility worked and permitted me to install the Intel b/g (my first choice, since it runs cool and uses little power).
It works great, the wifi indicator works properly as does the IBM Fn-F5 utility.
G40 wireless adapter upgrade, including compatibility list
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underclocker
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G40 wireless adapter upgrade, including compatibility list
T510, i7-620m, NVidia, HD+, 8GB, 180GB Intel Pro 1500 SSD, Webcam, BT, FPR Home
T400s, C2D SP9400, Intel 4500MHD, WXGA+, 8GB, 160GB Intel X18-M G2 SSD, Webcam, BT, FPR Travel
Edge 14 Core i5 | Edge 15 Core i3 | Edge 15 Athlon II X2| Edge 15 Phenom II X4
T400s, C2D SP9400, Intel 4500MHD, WXGA+, 8GB, 160GB Intel X18-M G2 SSD, Webcam, BT, FPR Travel
Edge 14 Core i5 | Edge 15 Core i3 | Edge 15 Athlon II X2| Edge 15 Phenom II X4
How about some pictures? Those things are such beasts. I probably wouldn't want to own one, but just like to look at them! 
Family Daily Drivers- T430s, T530, X220
Work- Sadly, the ThinkPads have gone away...... and replaced by HP ProDesk SFF drone machines
Other Projects- Edge 15, Z61m (Titanium)
Historic Retired ThinkPads- T42p, X20, A31p, 701c, 760XD, WorkPad C505
Work- Sadly, the ThinkPads have gone away...... and replaced by HP ProDesk SFF drone machines
Other Projects- Edge 15, Z61m (Titanium)
Historic Retired ThinkPads- T42p, X20, A31p, 701c, 760XD, WorkPad C505
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