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Root Rooted, want CM7, don't want to lose 4G

Discussion in 'Android Devices' started by TeamTJ, Apr 11, 2011.

  1. TeamTJ

    TeamTJ Well-Known Member
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    I've rooted my EVO (some time ago) and want to install CM7, but I've read of the risk of losing your 4G by flashing ROMS.

    Is there still this risk and how do I prevent it?
     

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  2. youdoofus

    youdoofus Android Expert
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    so dak
    Im using CM7 nightly 37 (upgraded from 22) and it says 4g works, im in a non 4g area, so i cant actually tell, but it says it works lol
     
  3. youdoofus

    youdoofus Android Expert
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    oh, and do a nandroid b/u with your wimax keys included so that if you change to an aosp rom of any sort that doesnt have 4g, you can restore with no ill effect. But you hafta make sure to select the wimax in amon manually as it doesnt auto select it...
     
  4. MizzouBrent

    MizzouBrent Android Expert
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    Yep, as long as you have a nandroid backup containing your Wimax keys, you should be golden. But for what it's worth, I don't think I've seen of anyone randomly losing 4G keys while flashing a ROM. There's always a chance that something bad COULD happen, but that's why you should always have at least one backup at all times.
     
  5. ghxost

    ghxost Well-Known Member
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    I read a few threads on here where people were suddenly unable to restore certain nandroids, IIRC it was more then one backup too. If this were to happen, is there a way to extract the keys from the nandroid? Or would you just be SOL if something happened?
     
  6. Covert_Death

    Covert_Death Android Expert
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    CM7 has had working 4g for quiet some time now... its the only AOSP with 4g that i know of... but here in OK i am able to pick up 4g on campus without a problem all day everyday with 7 down and 1 up speeds
     
  7. akazabam

    akazabam Android Expert
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    That sort of thing is usually user error. If not, there's probably not going to be anything wrong with the wimax backup. There are several ways to fix such an issue to, at least, restore wimax, such as moving the wimax.img to another backup, and fixing the md5sum files, etc. Just know that if you lose your wimax keys, and have a bad backup (unlikely), we can probably get it fixed, still. That being said, if you're that paranoid, you can do a manual backup by running this from the terminal emulator:

    su
    mkdir -p /sdcard/nandroid/RSA-PR-BACKUP
    cat /dev/mtd/mtd0 > /sdcard/nandroid/RSA-PR-BACKUP/wimax.img

    I got that from here. Don't actually do anything in that thread. I'm just giving credit. Anyway, should you need to restore such a backup, you should be able to follow the instructions here. Really, though, you should be fine if you just make a nandroid backup.
     
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  8. evomattnc

    evomattnc Android Expert
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    depends on what was causing the issue, you can extract the wimax.img from the nandroid with adb. I saw a thread on xda about restoring keys from a corrupted img. Looks like it can be done HOWEVER you would need to know what your keys were and what your cert was, basically it is a wimax.img template and you plug in your own info if so you would need to copy those things to your lappie.

    And akaza linked the thread i was referring to so taaa daaa.
     
  9. youdoofus

    youdoofus Android Expert
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    imagine that, akazabam being super thurough LoL who'da thunk? attaboy fellas :)
     
  10. evomattnc

    evomattnc Android Expert
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    lol me and akaza are tag teaming this forum today. I give the succinct, i have to get back to work but here are the cliffnotes to get you through answer, and akaza follows or leads with the superb everything you ever wanted to know about android detailed answer. I think its good team work :)
     
  11. akazabam

    akazabam Android Expert
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    Lol, you've been beating me to the punch a lot lately. Good teamwork nonetheless ;).
     
  12. evomattnc

    evomattnc Android Expert
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    LOL and as always thats only an indication that i should work more and troll less :)

    And that it takes you 10 minutes to draft your response lmao
     
  13. youdoofus

    youdoofus Android Expert
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    LOL!!!! i literally lol'ed! and i could totally use a laugh today, thanks again fellas
     
  14. youdoofus

    youdoofus Android Expert
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    sidenote, 6 hrs off charger with moderate useage(no different than usual monday activities) and 82% batt left!!!!!!!!!! OMFG!!!!!!! Lovin this new kernel!! Matt, you may also be interested in trying out the BFS kernel in my sig.... not linked yet, but i cant imagine that youd have trouble finding it lol
     
  15. evomattnc

    evomattnc Android Expert
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    Yeah I tried bfs once upon a time ago, phone wasn't super happy but I may try again. I'm 8 hours off with decent usage and at 75. I left data on all day though which is a big difference and I usually don't.
     
  16. MizzouBrent

    MizzouBrent Android Expert
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    I need to try a BFS kernel. I'm running SZ 1.1 CFS right now and I don't think I've ever flashed a BFS build. Do some people actually find that their phone performs better with BFS?

    I hate constantly switching kernels since my battery life the first 24 hours is hit or miss. It really seems to settle down on my phone a lot after a couple of days/charge cycles. Right now I'm at 59% at 8.5 hours off charger . But then the other day, with a settled SZ 1.0.1 CFS, I was at 20% after 24 hours of use after only being charged to 88% when I took it off the charger.
     
  17. evomattnc

    evomattnc Android Expert
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    Depends on what you are looking for bfs typically is better performance though if your screen is off enough you may get better battery. Basically consider cfs more flat line kind of performance and bfs a higher peaks and lower valleys...
     
  18. MizzouBrent

    MizzouBrent Android Expert
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    Yeah I get that, but it seems like people have more issues with BFS, and I don't know that I've ever seen someone who said that they get better battery life with it. But I haven't exactly gone looking for that info much either. I just flashed SZ 1.1.0 BFS by the way. So far it seems fine, seems about as responsive as CFS for me.
     
  19. evomattnc

    evomattnc Android Expert
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    Well it's the high peaks and low valleys that piss phones off sometimes. Takes a minute to wake from that low valley, lag etc
     
  20. MizzouBrent

    MizzouBrent Android Expert
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    What will I start seeing of my phone doesn't like it? Just general lag? Liking it so far...no issues yet and it seems responsive. Well see how the battery life turns out. I am going to try to give it a couple of days.
     
  21. evomattnc

    evomattnc Android Expert
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    You'll know if it doesn't like it lol
     
  22. MizzouBrent

    MizzouBrent Android Expert
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    What have you seen on bfs?
     
  23. MizzouBrent

    MizzouBrent Android Expert
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    By the way ever since you mentioned your thread ocd the other day its tempting to just make as many new comments as possible. LOL
     
  24. evomattnc

    evomattnc Android Expert
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    Lol no thread goes unturned, have mercy
     
  25. MizzouBrent

    MizzouBrent Android Expert
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    Ok I think I see one issue with SZ bfs ...I just had to hit power 2 or 3 times to get my phone to wake up.
     
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