Hi Losh, Here is a video series that uses Xmodem to upgrade the IOS of a 2610XM router. It should work very similar with your 1841.
Part 1:
Part 2:
Part 3:
In part 1, he goes into too much talk on how to set the baud rate, Just grasp and do the main procedure and you can move to part 2 which is where the core tutorial is. Just make sure you return the baud rate to the default on both your PC and the router after your done.
Note: I apologies for some censored words that the guy uses in his talk. The video is useful though, I couldn't find a better one to post. Other videos where for Cisco
switches. If others here have better links, please post.
