For those having trouble with patching Dolls' Frontline today, you may try these workarounds.
(Semi-crossposted in https://twitter.com/lloyd_dunamis/status/1329831674771738624 )
This'll be the path/directory we'll be working on, for all instances:
Android/data/com.sunborn.girlsfrontline.jp/files/Android/New/
[A] For those who hasn't キャッシュクリア/Cache Clear yet:
1) Delete the files named as the following in our working folder:
*.temp
*.dat
2) Launch DollFro. When you encounter an error, close the game then repeat to step 1.
[B] For those who have already done キャッシュクリア/Cache Clear or reinstalled the game:
1) Download these: (these are the same URLs of the initial files that the client downloads)
①http://gfjp-cdn.sunborngame.com/android/AndroidAllData_20201105CB6C365A89896FC50CB53DEC24203352.dat (1.01GB)
②http://gfjp-cdn.sunborngame.com/android/AndroidAddData_20201105CB6C365A89896FC50CB53DEC24203352.dat (1.4GB)
③https://s3-ap-northeast-1.amazonaws.com/gf1-jpfile-server/umqmSSiCXQ1zuldopbDUGlVCAugrpYDjdFEYTVGoDPEbmVEtmwfQ.txt (661KB)
2) Extract contents of ① to our working folder.
3) Copy ② to the folder.
4) Rename ③ to AndroidResConfigData.txt, then copy to the folder.
5) Launch DollFro; check 全データパック.
It should tell you that it needs to download 1636MB;
Client's progress should start from 80%, download only 168MB, then only extract the 1.4GB from ②.
Afterwards, it should land you straight to the login screen.
If you're having trouble with the extra 168MB download, you can download a collated version of it here: https://bit.ly/333U1BP
After you have extracted ① in the working folder, you can then extract this ManualPatch's contents to the working folder; replace when asked to.
Disclaimer: No warranty provided; provided as is; This was for personal use and it worked for me, but your mileage may vary. Worst case possible, you'd still have to Clear Cache/Uninstall anyway.