How Lenovo K900 reverted to 4 2 1

If you have strong hands-on ability and are willing to take the risk (failure to flash may lose the warranty), I personally recommend that you consider flashing your own machine. Lenovo asks for the K900 firmware area.

If you are not familiar with the flashing operation, it is recommended that you go to the local after-sales maintenance station to upgrade the flash. Service site inquiry.

If you are using the version you want to flash back, you can use the ST1403 stable package with the version number (viberom

Note that this package will erase user data, so please make a backup of your data.

This is the OTA card swiping package,Flash tutorial here:

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. Plugging in a special file system that requires third-party software such as 360 Helper 91 Assistant to access, 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 Apple mobile phone system is special, the above method is not feasible, if you want to recover the data is very important, you can contact the first oak me

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

Hello. We apologize for the inconvenience.

If the wireless network cannot be used normally after using the flash, it is not excluded that you make a mistake in the process of flashing the device or the system is abnormal due to flashing the firmware of a third party.

The firmware package has a detailed tutorial built-in, please be careful!

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

If you have other questions in the follow-up use process, you are welcome to contact us at any time or visit Lenovo Lewen (for consultation.

Hello, we are sorry that we may not be able to inform you of the most accurate plan because you have not provided specific information such as your product problem, please understand.

Please read the trade-off carefully before flashing, if you can't handle it yourself, please take the time to go to the Lenovo repair station to deal with it.

You are welcome to contact us at any time or visit Lenovo Lewen (for consultation.

Dear Lenovo mobile phone users, hello!

I'm sorry that this problem has delayed your normal use, if Lenovo mobile phone K900 is easier to get stuck and restart automatically, please recall whether it appears under a specific operation or software, it is recommended to conduct a simple investigation according to the following conditions:

a.Reboot is now present when specific third-party software appears:

1.It is not excluded that it will automatically restart due to compatibility issues, and it is recommended to uninstall and reinstall or replace other software of the same type.

2.This can usually be improved, but it is recommended that you back up your personal data and try a factory reset after attempting.

b.Occurs without a specific pattern:

1.It is recommended that you remove the SIM card and turn on the observation, it can be improved after removal, it is recommended to replace the SIM card, if so, it is not excluded that the card slot is abnormal, it is recommended to send it to the Lenovo site for repair;

2.If there is no significant improvement after the above operations, please back up the fuselage data for factory reset or system upgrade attempt.

Please pay attention to the following three precautions before making an upgrade:

1: Please ensure that the power is sufficient before upgrading, so as not to affect the operation during the upgrade process;

Attached: a: How to back up data:

Main Menu -- Backup & Restore -- Back up to SD card -- Check the data that needs to be backed up -- Click Backup below -- Click OK;

b: How to recover data:

Main Menu -- Backup & Restore -- Click Backed Up Data -- Click Restore below -- pop up the prompt box and click OK.

If none of the above operations can solve the problem, it is recommended that you go to the Lenovo maintenance site for inspection and maintenance in time.

Lenovo Authorized Repair Site Query:

Dear Lenovo users, hello!

Lenovo does not recommend that users flash the machine by themselves, after brushing the machine, they will lose the software warranty, and a certain fee will be charged to restore the system or involve software problems, and the hardware is still warranted, so please operate with caution.

IDEA Forum:

Think Forum:

Lenovo Community.

We apologize for the inconvenience.

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 available space through the system settings - storage to check the lead, and clean it up or try it in other time periods;

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 assist in processing.

Lenovo Authorized Repair Site Query:

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