OTA files exist as 2 different types. Please find information about each of them below.
Type 1: OTA Bitmap Image
The OTA Bitmap format uses one bit per pixel. As the format was for phones, there is no standard computer format. It may store as a binary file or as text hex, usually without spaces.
Header[edit]
B...
The OTA Bitmap format uses one bit per pixel. As the format was for phones, there is no standard computer format. It may store as a binary file or as text hex, usually without spaces.
Header[edit]
Before the image a four byte header: 00 48 1C 01. These are:
00 Infofield, always 00.
48 Width, 72 pixels.
1C Height, 28 pixels.
01 Number of colors, always 1.
Other sizes exist.
Encoding pixels[edit]
After the header the image starts.
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An OTA file extension may store a ringtone audio sample for mobile devices such as Android phones. OTA format is not commonly used for ringtones. MIDI-type ringtones used by Android phones are stored ...
An OTA file extension may store a ringtone audio sample for mobile devices such as Android phones. OTA format is not commonly used for ringtones. MIDI-type ringtones used by Android phones are stored in OTA files. OTA ringtones can be played with the file viewer on such phones. OTA is filename extension of over-the-air images used by older Nokia and Siemens phones. These OTA files are monochrome 72×28 pixel images saved in binary format or as hexadecimal data in a text file. Programs like XnView can view OTA images. OTA is also filename extension of files containing firmware updates for Spartan hunting cameras. This type of OTA file has bug fixes and updates for the camera’s firmware.
To open and use OTA files on a Nokia phone, access the file directly on your device. The phone’s system should automatically recognize the file. For more information, visit Nokia’s website. OTA bitmap images are used for monochrome image data on mobile graphics devices. Some software like XnView and online tools can convert these images to JPG or PNG. To open an OTA bitmap image, import the file into compatible software.
The structure of such files is typical of Raster Image Files. OTA Bitmap Image file format was developed by Nokia. An OTA Bitmap Image file was likely generated by XnView program.
Nokia Series 40 Theme Studio
Various Mobile Devices
Audacity