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application in the system [System update] . It allows you to check whether
any update is available and if so, you can download it from the internet and
install on the device.
The internal memory of the device is NOT used for updating system
software, so during the upgrade process you may receive the message
"Downloa ing an installing an up ate requires an SD car ." It means that the
update file is so large that it does not fit in the standard cache memory of the
device. Therefore, to properly perform the update process, insert the SD card
containing enough free space and specify it in the system as an external
memory. If the card is specified as an extension of internal memory, the update
will not be possible.
Remember that updates tend to have an expected size counted in
hundreds of megabytes, so we recommend that you carry them out when
connected via Wi Fi. Updating via the GSM network may contribute to the
operator charging for data downloaded from the internet.
Please remember that before upgrading, the battery charge level should be
higher than 30%. If it is lower, plug the device to the power grid and charge the
battery at least to 30% .
While updating the device might restart on its own a few times. You should
not remove the battery or use any of device features, as this may cause the
device to stop working.
18. Safe use of the battery
The battery may be char ed with USB port in the computer or laptop.
Nevertheless, it is not a recommended form of char in an operatin
device due to the low char in current offered by the USB - even thou h
the device is connected to a power source battery can still ets dischar ed.
If you wish to char e your device this way turn off the device. If the battery
level is low, rechar e it to continue the use of the phone. If you wish to
prolon the battery lifespan , dischar e the battery beneath 20% of the
battery capacity and char e it back to 100%. If not used, unplu the
char er from the phone. Excessive char in mi ht cause shortened battery
life. The temperature of the battery has an impact on its char in cycle.
Prior to the char in process, cool the battery or raise its temperature so
that it is similar to the room temperature. If the battery temperature
exceeds 40ºC the battery must not be char ed! Do not use a dama ed
battery! The battery lifespan can be shortened, if it has been exposed to
very low or very hi h temperatures - this causes interference to the phone,
even when the battery has been properly char ed.