To what does the patch need to be applied and how intrusive is the patching process? We are encountering the same bug and need to have this fixed ASAP.
I was having the same issue and I located these release notes from January. According to Cisco, 88XX Series phones V08 or later are not capable of downgrading below 11.7(1). Hope this helps.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/...
