1. If there is backup data, you can paste the backup "Billing Software Data Backup" folder directly to drive D, and then enter the system maintenance, backup and recovery options. From the retrieved data, select the latest backup, click Restore, and then click OK. Restart the software and enter normally.

2. The above methods cannot retrieve data or confirm the authenticity of data. Please contact the billing software provider for professional help.

3. The billing software has been cancelled for tax reasons, and it needs to apply to the tax authorities for restoration. Submit relevant information according to the requirements of the tax bureau and re-register the tax.