Can't Auto Provision W52P

[Yealink Support]

Hi steve,
1. Here i upgrade W52P to firmware 25.30.0.29, then use attached cfg file 0015653d522c.cfg (My base mac address is 0015653d522c) to auto provisioning with ftp server, and it works. The account information is apply to the phone.
So please check what's the difference between my operation with yours.
2. And i am not understand why your cfg file name will add / automatically?
This name is written by you, but why it will have / ?
3. This firmware is newer than 25.30.0.20 which we put in the website, but now we are still improve this firmware, we will release commercial firmware later base on 25.30.0.29, because we still fix some issues base on this firmware, it means this is not the last firmware that we will put in to the website.