http://www.droidforums.net/forum/dro...milestone.html Read it. I think you are good to go.
If it's unlocked, it's unlocked. Root and have fun. Try z4root.
Try z4root like FBM suggested. then download Rom Manager, flash clockwork recovery, make a backup, and start having fun.
If you can't find instructions for something PM me and I'll try and help.
Start by downloading z4root from the market right to your phone. Use it to root your phone. It should be easy, like one click easy. Then download rom manager from market and open, press yes when it asks for root access. Then press flash clockwork recovery. Next press backup current Rom. Should take 10 min. Now you are ready to install roms.
Hit me up on gtalk firstname.lastname@example.org if you get stuck.
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[APP] z4root - xda-developers
It says it's available in the market. If not, get it from there. Install it. Run it. You are now rooted.
As for installing the ROM, I hesitate to tell you how to see about getting one running because the latest Droid baseband is included in all of them AFAIK. I'd also STRONGLY suggest that you read up on BB v.5 and the installation procedure because it seems to be very tricky, especially for new users.
Thanks to great efforts and help from Furbearingmammal and hoppermi my alltel milestone a854 is now ROOTED!!!!!!! Im now running 2.2 Froyo and its pretty sweet. For those with similar situations. I installed Z4root straight from the market and rooted it. (one click) Then downloaded Rom manager after.... flashed it and performed a back up. After i tried to install http://www.droidforums.net/forum/metickone/95307-ota-rom-odexed-deodexed-frg22d.html. I used the odexed version (for now!) and rom manager rebooted the phone... and it just came up to normal 2.1 still. I simply reflashed it again. Turned it off. Opened recovery (hold x while powering up phone) wiped data and cache and installed the ROM above with no probs. All data/mms/voice works perfectly! MUCH thanks goes to Hoppermi who went way out of his way to help me almost 1 and 1/2 days. (not to undermind Furbearingmammal which suggested z4root)
Just a notery. when i rooted the milestone it classified my phone as a droid, not a milestone.