May I ask if my Lenovo K900 mobile phone was accidentally upgraded, can it be downgraded to the stan

The phone is Android, and the text message was accidentally deleted, how to recover it:

There are now two types of cases:

1. Plug in the computer and you can see the drive letter, just like inserting a USB flash drive. In this case, it is easy to do it directly on the Internet, and you can do it yourself with free software such as finaldataeasyrecovery and other recovery software.

2. Insert a special file system that requires third-party software such as 360 assistant and 91 assistant to access the computer, and this situation can also be recovered. But it takes professional equipment and more difficult technical means to recover, because in this case, the ** ** in the mobile phone is encrypted, even if I tell you it is not a moment and a half. If the data is important to you, it is recommended that you find a professional data recovery company to try.

The iPhone system is special, the above method is not feasible, if you want to recover data is very, very important, you can contact me

If you have any questions, you can ask them, I hope to help everyone

Hello. If Lenovo K900 needs to return to the old version of the system, it needs to be flashed. Due to the risk of flashing the machine by yourself, the failure of flashing may affect the warranty status of your equipment, so the official recommends that you can go to the local maintenance site for flashing, and the after-sales site query address:

If you have strong hands-on ability, have experience in flashing, want to flash the machine by yourself, and are willing to take possible risks. Personally, I suggest that you can go to Lenovo's official Lewen Firmware area**The official firmware of the previous version of your device can be operated.

The firmware package has a detailed tutorial built-in, please be careful. If you really can't complete it by yourself, we recommend that you go to the Lenovo repair station to flash the machine for processing.

You are welcome to contact us or visit Lenovo at any time

Consult to find out.

Hello. If you need to downgrade, you need to flash your device to downgrade.

There is a certain risk in flashing the machine by yourself, and the failure to flash the machine may affect the normal warranty of the device. Therefore, we do not recommend flashing the machine by yourself, you can choose to go to the local after-sales site to let the engineer assist in processing.

You can visit the official website for inquiries:

You are welcome to contact us or visit Lenovo at any time

Consult to find out.

Hello. The mobile phone upgrade is mainly for the optimization of the mobile phone system and the repair of some bugs, you can consider whether you need to upgrade according to your personal needs.

Lenovo K900The latest version is Viberom, support OTA upgrade method, because you can't know your current system version, it is recommended that you try it through the main menu - system settings - system settings - about mobile phone - system update - **path.

If the upgrade cannot be completed by the preceding methods, you need to flash the upgrade. Therefore, the version of the official Lewen bar is not provided for the time being**, and due to the risk of flashing the machine by yourself, the failure of flashing will likely affect the warranty of your device, for your benefit, we recommend that you take the time to go to the local Lenovo after-sales service center, let the engineer assist in the upgrade.

You are welcome to contact us or visit Lenovo at any time

Consult to find out.

Lenovo mobile phones are best to wait for a while before updating the previous mobile phone is Lenovo after the update of the brick ......

In view of the situation you described, the upgrade cannot be carried out after the factory reset, here it is first recommended that you try to go through the system settings - about the phone - system upgrade and operate under a good wireless network; If the problem persists, it is not ruled out that the storage space is insufficient or the server is congested during a specific period, it is recommended that you check the amount of free space through the system settings - storage, and clean it up or try it at another time period.

If the problem persists, it may be caused by corrupted system files, etc., so the flashing may be able to recover, and flashing the machine by yourself is risky and will affect the normal warranty of your device. Therefore, we do not recommend that you flash the machine by yourself, you can choose to go to the local after-sales site to let the engineer contact the master to assist in the processing.

Lenovo Authorized Repair Site Query:

The business hours of the maintenance site are usually from 9:00 to 18:00 on Sunday, except holidays, and the stations will be slightly adjusted according to their own operations.