The ZTE Joe's I've found in the past have been P727A, where these roms are for P727B, P727D & P727P devices.
On the Blade ZTE would change the last number to signify a change in Camera, or RAM or other such parts... so there is a chance these roms might work with the older ZTE Joe.
These images are TPT images, but I'd REALLY NOT recommend you install them to your device unless your feeling reckless... however they may be of use to someone who is more development minded.
ro.build.version.release=2.3.5 ro.build.date=Tue Nov 8 04:26:41 HKT 2011 ro.product.model=ZTE T28 ro.product.device=bluetick ro.product.board=bluetick
ro.build.version.release=2.3.5 ro.build.date=Wed Nov 30 14:03:29 CST 2011 ro.product.model=ZTE V875 ro.product.device=sailboat ro.product.board=sailboat
ro.build.version.release=2.3.5 ro.build.date=Fri Nov 25 11:20:05 CST 2011 ro.product.model=tmn smart a7 ro.product.device=sailboat ro.product.board=sailboat
GB_P727B10V1.0.0B09.zip (128.59 MB) http://www.multiupload.com/S5QNMQI58H
GB_VIVO_P727D40V1.0.0B02.zip (121.53 MB) http://www.multiupload.com/JKKTANEVE8
GB_TMN_P727PV1.0.0B07.zip (117.07 MB) http://www.multiupload.com/VX8AGC1S56