How to get your paid apps back in Froyo
Good news for you folks running Froyo who are sorely missing your favorite paid applications from the new and improved Android Market. A fix has actually been around at XDA Developers for a couple of days, and it's as simple as pushing over a new build.prop file that spoofs the Market into thinking you're running an older version of Android (Eclair really is ancient, ya know?) while keeping your Froyo goodness intact. There's really not too much hackery involved, though you'll likely want to run a nandroid backup first, just in case. And if you somehow have Froyo but still have no idea what we're talking about, better to just leave this one alone. [XDA Developers]
Note: Make sure the file you push back to your phone is, in fact, named build.prop and not something else.
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The missing apps are known as "protected" apps. They can be FREE or PAID apps. The problem arises because Google hasn't whitelisted this froyo rom to have full access to the market yet. You can't copy protected apps unless you have root access. However, if you have root access, you can change some info in the build.prop file and then you will be able to see and install protected apps. This is because the modifications make it look like your phone is running a different OS that is whitelisted. Hope that helps people out! But most PAID apps should still be visible, and any you had installed before will still be installed.