If you are talking about the firmware v2.01 file for local update, follow the steps below.
1. On a PC, download
DX300MAX-android11-v2.01.zip from iBasso server.
2. Unzip it, then you will find DX300MAX_full_ota_2.01.093.zip.
3. Copy and paste the DX300MAX_full_ota_2.01.093.zip to your SD card's root folder, or the DX300MAX's internal memory.
4. Go to Android OS, press Settings-->System-->Updater-->local update, and tap the zip file.
5. The whole update will take about 10 minutes. Reboot the DX300MAX after update completed. You can also choose to do a factory reset at this time to clear any artifacts from the previous firmware.
Or try OTA update. According to the iBasso announcement, it should be available starting today on Monday.