Alright as most of you know, At&t, and the HTC Aria, along with several others, are very difficult to root. let alone enable third party installs. However, The following worked quite well for me.
Installing the Amazon marketplace is the easy part.
if you know how to use, Google’s ADB Package, you can simply enable USB Debugging and the offline installer, and you are good to go.
However after that if you do not enable non approved market installs, thats as far as you get, you will be able to browse the amazon market, but not actually be able to install anything.
if you are not familiar with using ADB – then follow these steps prior to installing Amazon Marketplace –
Download the USB Drivers from unrevoked (YES! you need these, windows will detect your device as a usb drive, or a sync device, but it still needs to know how to talk to it as an android device.)
see their, HBoot drivers – and download and extract.
1. Power off phone – leave plugged in to USB and in debugging mode.
2. Hold Volume and Power on. (you will see your phone boot into a special recovery mode, leave it in this mode)
3. goto Device Manager, and select Android Device 1.0
4: Right-Click and select Update Driver
5. Install the new hboot drivers.
6. Reboot Phone back to desktop make sure it is connected by USB again with usb drive support and USB Debugging turned on.
Now on the HTC Aria, you don’t actually need root access, just shell access. Which SuperOneClick 1.7 provides.
Download SuperOneClick v1.7 (Search around its out there) or post a comment with your email and I will send it to you.
Launch superoneclick and run the “shell root” option.
You may see some errors, however afterwards still run, enable non-market apps.
On my phone it showed as failed, for certain functions. However, I attempted to download the free angry birds again, and it succeeded, I then attempted to download and install a couple more free apps, and they also worked.
As I stated above if you don’t know how to use Google’s ADB, and followed these steps then just goto amazon.com and request the download, and you will be able to download and install it directly through your phone