Here are the system files and tutorials.
This link was sent to me by CHUWI support.
(UBook X CW1535 OS)
[https://www.mediafire.com/folder/70625ia8bjm72/OS]
(Tutorial)
[https://chuwi.mediafire.com/file/77i0cs0riq8z3tx/windows_installation_system_tutorial.docx/file]
I applied this driver after recovering from the link above.
(Ubook X HID drivers)
[https://www.mediafire.com/file/ltexamus5han65a/Phoenix-hid-update-YWHF12003-SG12G-20200811.rar/file]
1、Copy the folder “Phoenix-hid-update” to the root directory of C drive.
2、Run “FirmwareUpdate.bat” as administrator, there will be a success message on the window, then prompt “Press any key to finish”, close the window at this time.
3、Run as administrator “ConfigUpdate.bat”, run successfully on the window with a prompt success, and then prompt “Press any key to finish”, then close the window.
In my case, the touchscreen was restored and finger touch was usable again. However, I haven’t been able to use the stylus pen yet. When I emailed support, they said it was a problem with the pen. But I doubt it, because I can use the pen on other device. If anyone can recover it with this link, please let me know if you are able to use the pen as well.