Push/Pull idle image?

[grawil]

I am looking at picking up some Yealink 32g phones for home use with Asterisk. I currently have some older cisco phones but they predate modern POE specs.

Does anyone know if it is possible to push/pull an custom (400 x 240 px) idle/background screen with a 32g? I can find reference to this feature, but can find no XML guide, examples or anyone with 1st hand knowledge of implementing this.

I realize this phone is EOL and there don't look to be any recent firmware updates from Yealink. Can anyone chime in on how stable the phone is on the latest firmware and whether the lack of updates is going to be an issue with Asterisk?