My lumia 630 is running windows phone 8.1 version 8.10.14234.375 . I signed up to recieve windows 10 through windows Insider app. However due to some problem update would always fail after 15-20% (error 801881d0). After retrying for 3-4 times the update would again start from 0% instead of resuming.
To avoid bandwidth overhead and slow download process, I setup squid (3.3.8) proxy on my linux machine. Squid has been caching properly. However although now update downloads lightning fast to my windows phone but only upto 40%. After that it again starts from zero.
A close inspection of squid logs showed that windows update is always failing on a '.cab' file which around 300 MB in size.
1444334340.611 247394 192.168.0.104 TCP_HIT_ABORTED/206 31657152 GET http://wp.ds.download.windowsupdate.com/c/msdownload/update/software/dflt/2015/09/microsoft.mainos.production.spkg_b0b882ca68291b814d6445713c005aba352423a7.cab - HIER_DIRECT/184.108.40.206 application/octet-stream
Please help. I have this file cached in my squid. But the windows phone simply would not download it instead throws the same (801881d0) error.