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Flash firmware on IconBit Callisto 300

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How to flash IconBit Callisto 300?


Why reinstall the firmware?

Errors begin to appear in the Android operating system.

Some installed applications stop opening.

Many programs from the Play Market do not start.

The phone shuts down and restarts for no apparent reason.

The phone slows down a lot during operation.

You are not satisfied with the functionality of the stock firmware.





Where can I find the firmware?

On the official website of the phone manufacturer.

On specialized services on which developers lay out custom or official OS.


What should be done before installing the firmware?

Back up your contacts and user data and transfer it to another medium.

Insert your SD card into your phone. It must have enough memory to fit the firmware.

Find out the exact model of your smartphone.

Fully charge your phone. If the battery runs out during boot, the device will no longer turn on.

Download the archive with Firmware and place it on the SD card.





Installing TWRP Recovery

Download the Official TWRP App to your phone from the Play Market. And install this app.

At the first start, you need to give consent to future manipulations, as well as consent to granting the Superuser rights to the application. Check the checkboxes and press the 'OK' button.

On the next screen, select 'TWRP FLASH' and give the application root rights.

TWRP

On the main screen of the application, the 'Select Device' drop-down list is available, in which you need to find and select the device model for installing the recovery.

After selecting a device, the program redirects the user to a web page to download the corresponding image file of the modified recovery environment. Download the suggested *.img file.

When the file is loaded, return to the main screen of the Official TWRP App and press the 'Select a file to flash' button. Select the file downloaded in the previous step.

After adding the image file to the program, click the 'FLASH TO RECOVERY' button and confirm your choice, click 'OK'.

The recording process is very fast, and upon completion, the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete.

Write the firmware and other necessary files to the SD card. Using a PC or laptop card reader, it will be much faster.

Insert a memory card into the phone.

To reboot in recovery, it is convenient to use a special item in the Official TWRP App menu, accessible by pressing the button with three stripes in the upper left corner of the main screen of the application. We open the menu, select the 'Reboot' item, and then tap on the 'REBOOT RECOVERY' button. The phone will reboot into the recovery environment automatically.





Firmware via TWRP

TWRP

Before flashing, you need to clear the 'Cache' and 'Data' sections, press 'WIPE' on the main screen. This will delete all user data from the device, but avoid a wide range of software errors and other problems.

Everything is ready to start flashing. Press the 'Install' button.


TWRP

The file selection screen appears. At the very top is the 'Storage' button, select the location where the firmware file is located.

Select the location where you copied the files. Press the 'OK' button.



TWRP

Find the file we need and click on it. A screen opens with a warning about possible negative consequences, as well as the item 'Zip signature verification'. This item should be checked by placing a cross in the check-box, which will avoid using damaged files when writing to the phone's memory sections.

The procedure for writing files to the device's memory will begin, accompanied by the appearance of inscriptions in the log field and the completion of the progress bar.

The completion of the installation procedure is indicated by the inscription 'Successful'.





Summary: Band: GSM 900/1800/1900, 3G; Type: smartphone; Operating system: Android 4.2; Case type: watch; Housing material: aluminium; Design: water resistance; The type of SIM card: micro SIM; The number of SIM-cards: 1; Weight: 76 g; Dimensions (Shvat): 45x54x14 mm; Screen type: color IPS, touch; Touch screen type: multitouch capacitive; Diagonal: 1.54 inches.; Image size: 240x240; Automatic screen rotation: yes; Type of melodies: polyphonic, MP3 ringtones; Vibrating alert: yes; Camera: 3 million pixels.; Audio: MP3; Interfaces: Wi-Fi 802.11g, Bluetooth, USB; Satellite navigation: GPS; Internet access: WAP, GPRS, EDGE, HSDPA, HSUPA, HSPA+; Protocol support ...

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