How to Upgrade my android os with my own (selfmade) custom rom ? - Android Q&A, Help & Troubleshooting

I have searched a lot on the web to make a custom rom of my own.
I want to upgrade my android device's OS to lollipop from kitkat.
the videos just showed little mods like changing the system apps and ringtones and product version.
If i want to change the os version is sufficient to change the lanucher, notification, bar and buttons.
Device: HTC DESIRE 620G
ROM: Stock rom
Rooted: yes

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Is there Any Rom Stock Rooted At&t lollipop?

Since update from AT&T is almost impossible, is there any plan to develop a Stock rom rooted based latest At&t lollipop?
Well I found this nice Rom Android Revolution HD 91.1, if you don't want to mess up or flash a new firmware
this Rom work pretty nice if you are on stock Att OS 5.12.502.2 same firmware and radio. this put you on to HTC OS 7.19.401.2 -Android 5.0.2 and HTC Sense 6. (recommended TWRP 2.8.5/ wipe in Aroma)
ROM Android Revolution HD 91.1 • High Quality & Performance • 7.19.401.2 • 5.0.2
http://forum.xda-developers.com/showthread.php?t=2183023
Download
http://android-revolution-hd.blogspot.com/p/android-revolution-hd-mirror-site-var.html
Its in testing [email protected] specific build
finanandroid said:
Since update from AT&T is almost impossible, is there any plan to develop a Stock rom rooted based latest At&t lollipop?
Well I found this nice Rom Android Revolution HD 91.1, if you don't want to mess up or flash a new firmware
this Rom work pretty nice if you are on stock Att OS 5.12.502.2 same firmware and radio. this put you on to HTC OS 7.19.401.2 -Android 5.0.2 and HTC Sense 6. (recommended TWRP 2.8.5/ wipe in Aroma)
ROM Android Revolution HD 91.1 • High Quality & Performance • 7.19.401.2 • 5.0.2
http://forum.xda-developers.com/showthread.php?t=2183023
Download
http://android-revolution-hd.blogspot.com/p/android-revolution-hd-mirror-site-var.html
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