rom - Miscellaneous Android Development

my phone is running android 2.2.1. when i looked for cwm through rom manager it says there is official cwm for your device. is there any version of cwm which would work on all froyo devices?

This is by design not possible as we don't own iphones. Every android model is different by design, hardware and partitioning from each other.

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Possible to install older versions of Android?

This seems like a long shot, but I'm wondering if there's any way to install an older version of the Android OS. I know it seems counterintuitive to want an OLDER version of Android, but it'd be really handy for app-testing purposes if I could switch between versions of the OS without resorting to emulators. Please let me known if you have any ideas.
P.S. I only have access to Nexus S and Galaxy S II phones right now, which both shipped with 2.3, so flashing an original, pre-update ROM isn't an option.
If you are rooted you should be able to find older ROMs for the nexus S based on android 2.2, so it would be easy to flash to that and revert to your backup when you are finished. As far as the SGSII it shipped with gingerbread, and I don't think a developer would take the time to port froyo to it...

[Q] Could it be hacked to install another "recovery" partition and custom rom ?

[Q] Could it be hacked to install another "recovery" partition and custom rom ?
I have bought a relatively cheap (not big brand) 1GHz due-core smartphone which runs Android 4.0.3. Recently, the SMS program crashes everytime I open it and I want to reflash the original Android 4.0.3 rom again. However, the manufacturer only flashes an Android 4.0 rom for my phone and serves me in a not-so-friendly way. They do not provide any information for the customers to reflash their Android roms themselves, and they also do not provide any information on rooting their phone. I have used the phone for just more than half a year and the phone's Android has crashed for 3 times.
I wonder is that any way that I could find out the hardware config of my smartphone and do some hacking to install some custom recovery and Android rom (e.g. Cyanogenmod) in the market. I do not want to depend on the manufacturer any more to accept their business manner.
Is there any suggestion or solution. Thanks a lot.
Lawrence

Extracing Android from one device and restoring to another (similar kind of device)

Hi, is it possible to extract fully working installation of Android from one device and then install it to another? The devices are similar, but the another one is apparently having some issues because it cannot finish factory reset. No need to preserve data files (downloaded software, pictures etc.) but just restore the device to working condition.
Device has ATM7021 CPU, 512MB, 8GB, 10.1" display and Android 4.2.2. Model number is P706.
A device branded GD IPPO looks similar but these tablets I have are not branded.
Hi, I know that it's a post long time ago.
It's possible to do it by making a full nandroid backup of your device firmware if your device has a custom recovery installed.
Unfortunately, I haven't found any custom recovery for ATM7021a yet.
Anyone have any idea how to install CWM or TWRP on ATM7021A? Thanks In Advance.

[Completed] [Q] CWM for the projector Smartphone. Firmware issue?

Hi,
I recently downloaded CWM 6.0.5.0 for my SM-G3858 running Jelly Bean. The thing is that when I flashed it I got a triangle (so it doesn´t work), then after a couple of seconds android´s stock recovery boots up. So no brick, but I wonder why CWM reco does not boot up for me. It works for another user but this user has an older samsung firmware installed. So I thought that the issue could be that I have a newer Samsung Firmware, as this CWM build was compiled from an older Samsung firmware source. But as far as I know a CWM build should work even tho the firmware has slightly changed (newer fw is still 4.2.2 Jelly Bean tho). So what could be the issue? Any ideas?
Sir,
You have already pointed in the right direction here: http://forum.xda-developers.com/general/xda-assist/errors-cm11-built-t3057271
Please understand that here we don't offer technical support only help new users for find the best place for asking.
Thanks
Thread closed

Installing a ROM of a different Android Version

I'm planning on replacing my stock 4.4.2 touchwiz ROM on my rooted I9505 Galaxy S4 but I want to get a custom ROM that is running Android 6 or higher. I have never done this before so I'm wondering if there are any precautions I should take.
To my knowledge the standard process for installing new ROMs is:
1. Get into your custom recovery
2. Make a backup of your current ROM
3. Wipe system, data, dalvik cache, and cache
4. Flash the new ROM
I heard somewhere that if your current device is running some android version (in my case 4.4.2), and the new ROM you're flashing is a different android version (6.0.1 or 7.0), then when you try to restore your original ROM there might be problems.
I also read somewhere that for new roms you also want to update your radio and bootloader? None of the big youtube tutorials I've watched even mentioned these things. If someone could elaborate that would be amazing!
One last thing, if anyone knows of good ROMs that's compatible with my S4, please let me know I'm looking for something that is running the more recent android versions (6 or higher), very stable so that it can be my daily driver, and has a good camera app (I hear a lot of custom ROMs have really bad camera apps).
Thanks for the help

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