Lost Bluetooth with navigation upgrade

[Big_kid]

I swapped in a 25797978 navigation unit into my 2011 Sierra 

everything works except Bluetooth. When I hold the phone button down I get a “beep” not a “ready” like my factory radio did.

I say “Bluetooth, pair, phone” all this comes back as “not recognized” I can however say “radio help” and get a response. 
My guess it the unit I got is from an earlier (07-08) truck and Bluetooth wasn’t an option until 09. Can my older unit be flashed with a TECH 2 for Bluetooth. Any help on this is appreciated…

[X-man]

I don’t know if this will help, but I have a 2008 Sierra that has the OEM nav unit. It did not come with Bluetooth. I swapped the VCIM which is under the radio for a 2009 and later unit that came with Bluetooth. To pair a phone using Bluetooth, the commands are <onstar> (Wait for response onstar ready)<Bluetooth >(response Bluetooth ready)<pair>

[Big_kid]

On 10/14/2021 at 12:06 AM, X-man said:

I don’t know if this will help, but I have a 2008 Sierra that has the OEM nav unit. It did not come with Bluetooth. I swapped the VCIM which is under the radio for a 2009 and later unit that came with Bluetooth. To pair a phone using Bluetooth, the commands are <onstar> (Wait for response onstar ready)<Bluetooth >(response Bluetooth ready)<pair>

you Sir are my new best friend. This worked perfect. Your help is appreciated. Thank you…