Zte firmware how to do a system update

Usually a poor WiFi signal that drops from the phone.

https://www.google.com/search?q=zte+keeps+disconnecting+from+wifi


..

try googling for firmware of zte max put it in memory card and install from there.

Try install new firmware

Frist go to imei.info

And check the chipest your cpu

Then search in google ( zte z828 stock firmware )

Follow steps and your device will be alive again

call zte

Almost all current Androids are the same for updates. From the main screen go into Settings > Software Update. You should see a screen that gives you the phone's current software version and a button for checking for updates. If you select About Phone from the Settings screen you should see options for the hardware itself including the kernal and hardware version.

Most manufacturer's have the phones by default periodically checking for and applying updates - including the phone's firmware, so you usually don't have to worry about it.

There may be few possibilities like the network not recognized,
locked with some other network,firmware not updated etc...
Network Not Recognized:
First, go to Settings-->Then go to Wireless and networks.-->Then Tap Mobile Networks (If mobile networks not found then tap More settings and then find and tap Mobile networks).-->Now tap Networks operators.-->After complete searching.... Then select your Network Operator (Like Vodafone, Idea, AirTel, etc.)
That's it, problem solved.

Locked with someother Network:
I suggest you can approach Simpleunlocking.com and specify the country,locked network of ZTE .Based on the availability you can get the permanent unlock code along with free instructions.

UN-updated firmware or software:
Select Software Update and Wait For It to reboot and Completed Update Completed!

There may be few possibilities like the network not recognized,
locked with some other network,firmware not updated etc...
Network Not Recognized:
First, go to Settings-->Then go to Wireless and networks.-->Then Tap Mobile Networks (If mobile networks not found then tap More settings and then find and tap Mobile networks).-->Now tap Networks operators.-->After complete searching.... Then select your Network Operator (Like Vodafone, Idea, AirTel, etc.)
That's it, problem solved.

Locked with someother Network:
I suggest you can approach Prounlocking.com and specify the country,locked network of ZTE .Based on the availability you can get the permanent unlock code along with free instructions.

UN-updated firmware or software:
Select Software Update and Wait For It to reboot and Completed Update Completed!

Can anyone give me Toshiba e studio 355 firmware file? or a download link?

as per ZTE FAQ http://www.zte.com.au/telstra/faqs.htm this will give you a ZIP file to fix it.