1. install ER.BDT.Tool
2. navigate to your Game folder, copy oo2core_6_win64.dll to ER.BDT.Tool folder. Make it be in the same folder as ER.Unpacker.exe.
3. search Windows Powershell in startmenu, then open it.
4. copy this command to Powershell to cd into ER.BDT.Tool folder.(otherwise the oo2dll will not be recognized)
Note that you have to change the path according to your file location.(ER.BDT.Tool is the folder that contains ER.Unpacker.exe)
cd G:\Games\VortexResource\Games\eldenring\tools\ER.BDT.Tool

5. copy this command to your Powershell. Note that you have to change the path according to your file location. The extracted files take about 18G.
.\ER.Unpacker.exe "E:\SteamLibrary\steamapps\common\ELDEN RING\Game\Data0.bhd" ./output

6. now navigate to your output folder, output\msg\engus. you will see msgbnd files(without the dcx extension)
7. install Yabber
8. drag item.msgbnd to Yabber.exe, then you will get a folder item-msgbnd next to item.msgbnd file.
9. go into the folder,  open _yabber-bnd4.xml
10. inside xml, change filename from item.msgbnd to item.msgbnd.dcx, and compression from none to SekiroDFLT.
11. then drag the item-msgbnd folder onto Yabber.exe
12. now you get the item.msgbnd.dcx file next to your item.msgbnd file.
13. do 8~11 for menu.msgbnd file.