I have 15 Cisco phones model SPA502G in the company and i'm connecting them to the PBX by IP address and subnet mask. Now i purchased new phone model 8845 but i couldn't registered the phone in the same way as it's required CUCM QR to register the phone but i don't have the Cisco call manager system and i'm not planing to have it as well. I just have one 8845 IP phone in the company. Is there any way to register the phone without using the Call manager system??
Had a look at the photo and the phone is loaded with Enterprise image.
You will need to convert the phone from Enterprise image to 3PCC: Cisco Cloud Upgrader
I already tried to upgrade the firmware by following the steps you shared in the link but the phone failed to upgrade. I sent you the screenshots after i tried to upgrade the phone.