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well fiddlesticks.....lol.
can i at least upgrade to the .4 from the OPs first link?
Is this for the problem with the Eris sometimes not haveing any signal bars but still able to deliver sms and calls most of the time.most likely you will still have the low signal problem you should try the *228 option 1 and 2 if that does not help try this
FIRST download the prl from the attachment or from http://www.fileden.com/files/2010/4/14/2827506//51425m.prl and unzip it to your sdcard
1: dial ##775 and press call
2: password is 000000
3: click Update PRL
4: have the PRL file on the root of the SD folder
5: be sure and click the prl you want to update underneath the OK/CANCEL button (minimize the keyboard since it hides the prl info when maximized)
6: press OK
7: press Menu / Commit changes
8: phone restarts.
thanks guys. I got the latest update. xx.4
All is good. no root, but it is faster than my previous .1 version.

From what I understand, you have to be on 1.5 to move to 2.1 root. If I am wrong I am sure someone will correct me, but I believe you have to root while still in 1.5 and then you can load custom roms from there in which there are 2.1 roms available. Devs have not been able find a way to root the leaked 2.1 rom yet.
Then why would I want to install this leak version instead of the root version? Both methods get you the same 2.1 right? But one lets you root, and be able to go back to 1.5 if you should need to, that all sounds like it is better. I missing something obvious about this leak version?
do you need root to do this?
Ok, I have tried to do this update more times than I'd like to mention. I downloaded the correct file showing the correct and exact MB (103). Moved the zip file directly to my sd card (lowest level) and when I go to reboot the phone is still showing the old version.
DESIREC XC SHI S-ON
HBOOT-1.47 000
MICEOP-0111
TOUCH PANEL-SYN0104
RADIO-2.32.40.11.09
Oct 23 2009, 17:02:23
It seems my phone just doesn't want to accept this new version. I did EXACTLY what the tuturial said to do. I even went as far as a hard reset and wiping out all the data I had on my SD card. You guys have any Ideas on what I may have missed?
There's no way in hell you could talk me into installing an OS on my phone that could have been made by some freak with some diabolical plan and far too much time on his hands.
Haven't you people ever heard of things like keyloggers and malware? Just because you don't see them doesn't mean they aren't running.
BE PATIENT!!!
Wait for the official OTA update. It's not THAT big of a deal that you need to have it now and risk bricking your phone over it. SHEESH!!!!!
Wow so are you saying you don't install apps? Because the same people that helped get v1 going are the same people who write apps for the phones.
Can I delete the zip file from my SD card now that I upgraded? I noticed it is still there.
I know this probably gets annoying have all these newbies asking questions but before I go ahead a do this update I want to know if I use the newest 2.1 version will I lose my contacts and all my applications? And if that's the case, can I restore them with WaveSecure?
It will show the old one while searching for the zip file. It will take a minute or two and then you will need to hit the trackball to say OK to updating. I don't remember the exact message it gives but it does take a little bit of time.