Unlike the L4 version which used custom fonts, the L5 version uses default fonts .
The .7z (7-Zip) format is used for this firmware because it provides significantly better compression than standard ZIP, making the firmware image smaller for distribution. Other Potential Interpretations
If you are looking for the technical text on how to create a 7z file using "Level 5" (Normal) compression, you can use the command-line tool 7-Zip with the switch -mx=5 .
In this context, (specifically the file DX90FirmwareV2.1.5-L5.7z ) represents a specific iteration of custom firmware with the following characteristics: Base Version: It is built upon the stock version 2.1.5.
It includes all improvements from the "L2" and "L4" versions, such as increased gapless buffer size , custom NTFS drivers , and system cleanup.
