Is the no-1802 modification completely reversible?

[kidtriton]

I have a T41 with a 2100b card in it from the factory. I have a generic intel 2200bg card in my possesion that isnt IBM branded. I kinda want to try it out, and i know about the no-1802.com modification, but i don't want this as a permanent solution, so i will eventually change back to my IBM 2100, or get an IBM 2200 (i think the wireless led indicator not working would bother me).

My question is this, what does the no1802.com file change? and is it reversible? Does it just change some of the code of the bios program? would re-flashing the bios with the same version im on remove what the no-1802 mod. does? or does it change something in the firmware that the bios update software doesnt?

thanks

[david.lister]

try to look here

http://jcnp.pku.edu.cn/~shadow/1802/

there is file no-1802.com which writes to cmos memory. but there is also file 1802.com. so i think, this file should put your cmos to previous state. i used it already. i applied patch no-1802.com, replaced intel 2100b with intel 2200bg and reflashed eeprom of new card (card is now visible in access connection tool and sw installer detects card correctly). as last step i applied 1802.com so i hope i have cmos in previous state. and my card looks like intel 2200bg braded by ibm (subsys_27128086)

[Marcski]

i think updating your bios erases the patch..

[kidtriton]

cool, thanks for the replies guys. However, i did get my hands on a "real" ibm 2200, so i have put it in (i had to do a bios upgrade because at first i got the 1802 error).

Now, i cant remember if i had the Fn F5 thing working or not with my 2100 card. The LED indicator does work with this 2200 and i used intel's reference drivers off their site. I am one of those 'minimalist' guys that dont want to install the ibm software and utilities if i dont have to. For example, i will not install stuff like access connections, ultranav wizard, presentation director, etc. But i do install the on-screen utitlty and the battery maximizer app.

I get the message "IBM Wireless adapters are not installed in this system" when i hit Fn F5. If i could fix this without having to install all of the IBM stuff then i would like to get it working.

[stangri]

bios update will not (at least it didn't for me) wipe out the 1802 hack. removing the battery, power supply and then disconnecting that tiny batter under the palm-rest will clear the CMOS tho and will reset your CMOS to factory default (I'm sure there's a simpler way to do that tho).

I believe I've had to install the IBM version of the drivers to make Fn-F5 work on the non-IBM wifi card. I think I might have had to fix one of the config files for installer, but I'm not sure at this point.

PS. I see where you're coming from with wanting to install "original" drivers, but I would lean towards the IBM drivers for the T4x for all purposes.

PPS. You can also hack your intel card for the T40 to recognize it as IBM-branded, it would not require the no-1802 CMOS fix.

[kidtriton]

bios update will not (at least it didn't for me) wipe out the 1802 hack. removing the battery, power supply and then disconnecting that tiny batter under the palm-rest will clear the CMOS tho and will reset your CMOS to factory default (I'm sure there's a simpler way to do that tho).

I believe I've had to install the IBM version of the drivers to make Fn-F5 work on the non-IBM wifi card. I think I might have had to fix one of the config files for installer, but I'm not sure at this point.

PS. I see where you're coming from with wanting to install "original" drivers, but I would lean towards the IBM drivers for the T4x for all purposes.

PPS. You can also hack your intel card for the T40 to recognize it as IBM-branded, it would not require the no-1802 CMOS fix.

thanks for the info, however i did end up getting a real ibm 2200 before i had the change to try the generic intel one. Now im in a situation where the only way i can get Fn F5 to work is to use the ibm ver 9.x drivers and the latest access connections. I uninstalled access connections and with the driver alone from ibm, the Fn F5 doesnt work. So, i have the reference drivers 9.0.3.9 loaded for now. I want to get the older 8.x ibm 2200 drivers from whoever has them because i think i can use them along with its version of the sebring api to get Fn F5 working without access connections.

[stangri]

not sure why it's still giving you a hard time -- I've never used access connection and Fn-F5 worked fine for me for both IBM branded and generic Intel WiFi cards.