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I can't apply the market updat - just rooted. Never had this problem. I was on leak 2.v3 and did the new root method. Worked okay, would like to just go back to stock If I can.
Telling us what ROM you put on your phone would be useful - by no means do they "all act the same".
Was it a ROM that required that you flash a "Gapps" package after the ROM flash, but before the first boot (e.g. TazzFroyo?)
The other thing to bear in mind is that the Market itself seems to misbehave from time to time. That may not be the case here, but it happens often enough that just waiting a little bit and re-downloading the app should be tried.
eu1

Telling us what ROM you put on your phone would be useful - by no means do they "all act the same".
Was it a ROM that required that you flash a "Gapps" package after the ROM flash, but before the first boot (e.g. TazzFroyo?)
The other thing to bear in mind is that the Market itself seems to misbehave from time to time. That may not be the case here, but it happens often enough that just waiting a little bit and re-downloading the app should be tried.
eu1
off topic....EU, see your sig in that post? and mine in this one? until we post 10 more times in this thread, they wont show up again.
and to the OP, which gapps package was it? if its signed wrong thats an easy fix, but also leads me to think your doing something wrong-a dev isnt going to use a gapps pack that doesnt work-they are kinda important
if its an issue with the gapps, what rom are you on and we can either find one that works for you or i can re-sign the one your using.

Since the OP hasn't answered for a while, maybe you guys can help me.
I'm running the Generic myTouch ROM with Root, from this how-to guide.
How To: Load a Custom ROM on the HTC MyTouch 3G | TheUnlockr
And a link to the ROM itself.
MEGAUPLOAD - The leading online storage and file delivery service
Just now when I enabled the wifi tether app just to play with it, the default name for the wifi was G1. This rom is based on 1.6, but do you think there's a chance my phone thinks it's a G1, which is why it won't let maps install??
Would very much appreciate the help, as this is really pissing me off, lol.
maps wont install? i need a little more info than that. was it installed from the market? or was it a seperate flash? and whats the error when installing/flashing it?

uno momento por favor
froyo or eclair? ill put you together an update zip of the new one.


wow. donut? lol
i wonder if thats the issue in itself though. donut is really outdated, it may not be compatible.
nope
i got my eris with 1.5, within an hour i was on the leaked 2.1, so i havent had much experience with <2.1
but yes...i recommend jumping on a different rom and then updating. im almost POSITIVE thats the issue
lol, right on. All right, well after tonight I can start screwing with it. I'll probably do a CM ROM, but I kinda don't want anything newer than 1.6, as this phone is already slow and the newer OS will probably just slow it down even more.
CM roms are usually light and quick, i would go for a 2.1 rom though. i know that when 2.1 hit for the eris, there were new maps features. just my $0.02

IIRC Donut supported maps, but not the full nav. Now the new maps app I think has all the nav in it, so I definitely second the motion to abandon Donut. Should work fine with Eclair +
Agree with your thought process, but 3 days ago I was running maps 4.4 on the oem Donut with no problems. Maybe this is ROM is based on a slightly older version of Donut??