1. If you are using MTV3200 / 3700 / 7000, factory reset clears a DMB-T/H mode setting.
2. Magic TV arranges the frequencies such that popular frequencies listed in the OFCA table are searched first. You live in a building that rearranges the frequencies, so they will be scanned much later.
3. This is a test channel from Fantastic Television 奇妙電視, and is often found in public housing. This is a really bad channel because it used to screw up the date / time, which in turn could screw up the scheduled recordings. Set it to unfavourite then delete it.