So I was wondering whether it's possible to downgrade my old Nexus One which is currently on gingerbread back to Froyo. If so, how do I go about this? I don't know much about downgrading on Android, but I think I have to root the device first and then flash a stock ROM. If that's the case, where could I find Android 2.2 ROM for my Nexus One? Any help is appreciated.
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I would like to downgrade my Nexus One to 2.2.2, because I've had non-stop problems with Gingerbread. I have the 2.2.2 update from , and going off the , I'm under the assumption that this is doable.  So I've gone through the Bootloader -> Recovery -> apply sdcard:update.zip steps, and it fails with the following message:  assert failed: file_getprop("/system/build.prop", "ro.build.fingerprint") == "google/passion/passion/mahimahi:2.2.1/FRG83D/75603:user/release-keys" || file_getprop("/system/build.prop", "ro.build.fingerprint") == "google/passion/passion/mahimahi:2.2.2/FRG83D/91102:user/release-keys"  E:Error in /tmp/sideload/package.zip (Status 7) Installation aborted.   I would guess the OS is checking if I'm on either 2.2.1 (updating from the previous version) or 2.2.2 (reinstalling the target version), is this assumption correct?  This begs the question, how do I go from 2.3.6 to 2.2.2? Do I need to factory reset, and apply updates sequentially?
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I have two phones, the  and , both using Android 2.1, and I intend to sell them in the near future.  Before selling (just like before selling a HDD), I want to wipe all the personal DATA from the phones.   Question: Does a "factory reset" (from the Android phones "menu") surely wipe all the personal data? Or will there be something left to use? (ex.: contact list, Gmail password, etc.?)
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I got my Galaxy S4 today (i337M), it's wayyy better than my old SII hehe.  I immediately removed the stock Bell firmware and put the latest snapshot available from CyanogenMod.  I'm wondering if it's possible to convert apps like S Planner, S Note, S Health to CyanogenMod.  Current stock android version available for i337M is 4.2.2. Latest Android version for CM is 4.4.  If I install CM 4.2, can I import/install the APKs and then upgrade to 4.4?  Hope you'll be able to help me :)
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I want to learn how to root a android phone manually, I mean without any apps like KingRoot, dr.fone etc. I did not found any guides or information about it.  (Background Information: I want to root a BlackBerry KeyOne, even if you say it does not work i want to learn and try it anyway)  Can you please help me?
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I've been looking all over for a proper explanation of how to delete photos from the device (nexus 5) to reclaim some space, while being sure that the pictures are still in the Google+ backup. Unfortunatley i have not found one, other than "wild claims" it works somehow, while other say it does not. Plus deleting photos via the Pictures app actually warns you (now?) that it will delete the backed up copies too. Do i have to delete them in the Gallery app?  I did delete some photos recently, and i was quite sure they ware still backed up (still showed up on the Google+ website) but looking now i see they are in the trash in the device.  Is there really no way to be able to know for sure if the pictures are backed up savely while i can delete them from the device?  Alternatively i'm also open for alternative solutions to this problem, or i just go back to the "good old copy and paste when plugging the phone".
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I just got a new 32GB SD card for my Nexus One. On the old one I have a bunch of apps installed and store the data there because the internal memory doesn't handle it.  So now I want to switch SD cards, but how do I go about doing that without causing any issues?  Do I just simply copy-paste everything, or is there another way to do it?  I'm on stock firmware on the Android and using Mac OS X Lion.
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I have a Nexus 7 2012 wifi. With the latest version of Lollipop it has really become unusable, freezing for a minute or more, or even rebooting while loading a page in Chrome.  I did a system reset, but that did not change much past the few first minutes.   What is the recommended version to have again a usable tablet? Is anyone having a "runbook for dummies" to install Android 4.x (or CM or whatever works fine) ?   Most of the tutorials I found on the Internet are for geeks wishing to experiment. I just want a running system with minimal fuss/risk.
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Are there any risks to manually flashing a stock or custom ROM?   Does it have the potential to brick the device? Will it void my warranty? Will I stop getting updates? Anything else I should be aware of?   (See also: )
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As I understand it, Android Lollipop (5.0) is now generally available over-the-air. My Nexus 4 briefly offered for an hour or two to install it. I said yes, and watched it start to download. When I next went to unlock my phone, it obviously wasn't installed. Now, when I go into the Settings app, and manually check for updates, it says my phone is up-to-date. It's still on Android 4.4.4.  I don't particularly want to install the developer image, as that'll wipe all the data from my phone. Is there any way I can encourage it to update?  I'm in the UK, if it's relevant.
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I was having trouble playing the game on my android so I downloaded it to my wife's phone (Galaxy S6). I read some posts on how to get it running on my android and it worked but, my level 7 account is on my wife's phone.  How do I get it back to my android? When I sign out and back in it doesn't ask for any sign in info. I've tried deleting the app's data and even uninstalling and re-installing, but it still doesn't ask for sign-in info.
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Does the Android operating system support installing new fonts?  I am that person who adores calligraphy and improving handwriting, and I am proud to say that my handwriting is now more beautiful than my teachers in almost every language I know! Anyway, can anyone answer that question (about Android fonts), because this will judge if I will buy a ruuning-Android tablet pc or not!
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Android 2.3 (Gingerbread) SDK was . ()  Of course, not all devices will get this update right away and others won't get it at all. Each manufacturer and carrier often choose to add their custom modifications which tend to delay the official release.  When will each device get Android 2.3, either officially or unofficially, if ever?  See also:
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This Community Wiki question is designed to be the "canonical question" for questions asking how to upgrade one's device to a new Android version.   I want to get a newer version of the OS for my Android device. How can I do that?  See also:
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I am soon going to unlock bootloader and root my Nexus 5, but I didn't wanted to wipe all the data so I thought of using the ADB backup function to restore after rooting is done.  adb backup [-f &lt;file&gt;] [-apk|-noapk] [-shared|-noshared] [-all] [-system|nosystem] [&lt;packages...&gt;]   So, I made a full backup, with apk, with shared, all.   First of all, what all does this command backup? I suppose everything. Does it include the system, that is, Android files, like the main ROM files including kernel and stuff? Will the ROM get restored after I restore this backup?  Also, after I have rooted the device (which I have still not done), will I be able to restore just the apps, app data and shared storage from the backup? Or should I just backup the apk with shared data backup and that will do it?  Is it possible with a third-party app, root/non-root? (Titanium Backup, maybe?)  I need to know more.
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I came across a how-to guide for running Android 1.7 in a virtual machine (VirtualBox), but 1.7 is old. I haven't been able to find a Android 2.2 or 2.3 image anywhere, does anyone have any ideas on how to virtualize newer Android OS's? Preferably a free virtualization solution like VirtualBox.  Here is the link about virtualizing 1.7:    They send you to here to download Android disk images:    But I can't find anything newer than 1.7, anyone have any ideas?
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Can anyone tell me whether the information at "" still holds for the 2nd generation Nexus 7?  I'm thinking that there may be new compatibility issues, since the hardware/chipset changed.  If the images don't work for Nexus 7 (2013), are there any plans to migrate to and support this device?  Thanks for any help and advice.
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I understand that unlocking the bootloader will wipe my Android phone, but have been looking around for why.  Seems to be by design, but what is the reasoning for that design?  Is it some security concern, some obscure technical reason, or just for lulz?  I'm looking for something solid to chew on here, something more than because "that's how it is".