From the Tech Portal :
http://rweb.echostar.com/departmental_content/TechPortal/content/tech/TechRemo3.1Trou.shtml#dualuhf
For the 625:
* Using the original Green Indicator Tab remote control at TV1, Press the MENU button on the remote control in SAT mode.
* Select System Setup, Installation, TV1 UHF Pro Setup.
* Using the Green Indicator Tab remote left arrow button to highlight and select Enable.
* Using the Green Indicator Tab remote right arrow button to highlight and select System Info.
* Using the Green Indicator Tab remote, arrow up to highlight the Primary Remote Address.
* Address the additional Blue Indicator Tab UHF Pro remote so that it is different then the Secondary Remote Address currently set for TV2.
* Press the red Record button on the additional Blue Indicator Tab UHF Pro remote. The Primary Remote Address for TV1 should change and include the words "IR and UHF Pro".
* Note: If the Primary and Secondary remote addresses are the same when doing this procedure, Error 590 will appear and you will not be able to continue the process.
* After completion, select Done to exit the System Info screen.
For the 622:
* Confirm customer is using 6.3 Replacement remote. Explain
* The 622 can only be used in Dual UHF Pro mode with a 6.3 Replacement Remote. The model number on the back of the remote should say "6.3 IR/UHF PRO" with part number 143040. The SAT mode button has a black ring around it.
* Using the original Green Indicator Tab IR remote control at TV1, Press the MENU button on the remote control in SAT mode.
* Select System Setup, Installation, System Info.
* Put the Green UHF Pro Indicator Tab with the black number "1" in the 6.3 Replacement Remote.
* Press record.
* The Primary Remote address field should now say UHF Pro Band A.
* After completion, select Done to exit the System Info screen.