Thank you for reaching out. This is Joey from Oneplus Customer Support. Sorry for the trouble you have gone through.
I understand the urgency of having your issue resolved / of being able to use the phone again to its full potential. There will be a need to proceed with booking a remote session to resolve your issue. During the remote session, a Level 2 Tech Specialist will be sending certain files to be extracted together with the installation of certificates and drivers on your PC. There will be a need to tether your OnePlus X to your PC and through the remote session, patch fix/ flashing to another ROM may be performed. Furthermore, the process should approximately take up to an hour and you have the option to stop at any point in time.
Access the link below to book for your preferred remote session schedule and reply to this email with the date and time that you booked so it can duly noted.
EST Time Zone: https://www.oneplustech.setmore.com
Before the remote session, it is necessary to back up your files from your OnePlus X and that the following files below have been downloaded on your PC. Please note that we need WINDOWS MACHINE for this process (Windows 7 & above).
Oxygen -https://s3.amazonaws.com/oneplussupport/Opx/OnePlus_15_A.06_151130.rar
Certificates - https://s3.amazonaws.com/oneplussupport/qc.rar
USB Drivers -> https://developer.android.com/sdk/win-usb.html
NOTICE:
Our Tech Support only accesses to the files/application on your PC that are necessary for troubleshooting. We do not and are unable to store, or disclose any information we have access to during this process. The whole process is done with the customer’s presence, who has the right to terminate the process anytime during the process.
Also, I would like to have your Order number so we can further assist you with this matter.
•Order Number:
-can be found on the official receipt or;
-Login to OnePlus Website > My Store Accounts > My orders.
I'm looking forward for your feedback.
Best regards,
Joey