Actually, I’ve been working on DX220Max together with PerfectDynamics 3.0 update for a while. Today I’ve finally finished PerfectDynamics 3.0 update. Google also stopped blocking uncertified device so Google Play Store is back now. 🙂
-Based on iBasso DX220Max firmware version V1.01.123
-PerfectDynamics 3.0 Sound Optimizations applied
-Google Play Store added
-Apollo – Fidelity Edition from https://forum.xda-developers.com/android/apps-games/apollo-music-player-fidelity-edition-t3038629 included
-MangoPlayer app has optimizations applied
-build.prop tweaks for better video and storage performance and improve battery life
-Audio engine optimized for only audio playback (EQ/Gaplass features work)
Download: iBasso DX220Max Purist ROM
Installation Guide
1. Install Rockchip USB driver included in iBasso DX220Max Upgrade Tool and make sure it shows ‘Found One ADB device’ in AndroidTool software
2. Extract OTA ROM from Official Oreo ROM firmware to DX220Max’s internal storage and flash from Settings > System > Updater > Local storage
3. After successfully flashing official ROM, go to Settings > System > About tablet and tap “Build number” for 7 times to enable “Developer options”
4. Tap back arrow to enter “Developer options”, enable “USB debugging”, and press OK
5. Connect DX220Max to computer with USB connection in Android mode again and press OK to allow USB debugging
6. Download Disable Verity package and run disable_verity.bat file to disable verity and restart (Authorize USB debugging on device and run again)
7. After DX220 boots up properly with Verity disabled, run reset_loader.bat file so you can enter loader mode
8. Open AndroidTool, click on “Upgrade Firmware” tab, click on Firmware button and select update.img extracted from Purist ROM then click Upgrade
For Mac / Linux users, please check this guide for flashing Fidelizer Purist ROM on Mac / Linux instructions.
PerfectDynamics Sound Optimizations 3.0
It’s supposed to be out 2 years ago but I’ve been so busy with hardware products so I hardly have time to conduct research and finish my software projects. But now it’s finally done with full Oreo optimizations and new breakthrough of PerfectDynamics Sound Optimizations.
Fidelizer’s Core Isolation optimizations is now also available in free Purist ROM version
When I first heard DX220Max, I felt it was a bit disappointing because stock ROM doesn’t come with Fidelizer Purist ROM’s magic. This feature is quite important for octa core DAP to sound good so I decided to implement this feature in free version also.
With Fidelizer’s core isolation optimizations applied in Purist ROM, the result was truly magical. It sounds like all instruments used to perform in small room and now they’re performing in great hall that each instrument can have its own optimal space.
Dual governors scaling for better sound quality and battery life
Default configuration uses Interactive governor on all cores and this governor will consume more battery life. In PerfectDynamics 3.0 optimizations, primary cores will use OnDemand governor and secondary cores will use Conservative.
OnDemand will save a bit of battery life on primary cores and since secondary cores will save even more battery life with Conservative since they won’t have high utilization. Both governors are optimized for best sound quality with good battery.
Since this feature has both sound quality and quality of life improvements for better battery optimizations that can work on many devices, I decided to implement this feature in free version also. Pre-Oreo ROM may have partial effects.
Both Enhanced and Advanced ROM now have Sound optimizations improvements and optimized for Oreo environment
It’s been almost 2 years since PerfectDynamics 2.0 and I’ve made some finer adjustments since then. Now PerfectDynamics features will be fully implemented in all purchased versions. Advanced ROM still has more low-level optimizations.
Enhanced battery saving in Advanced ROM with screenstate optimizations
Battery saving is rarely preferred as most people prefer better sound quality. Now battery saving technique is improved for focusing more on battery saving when screen is off and provide better performance when screen is on. I also adjust configuration based on RAM and free cache too.
Enhanced application optimizations in Advanced ROM
In PerfectDynamics 3.0, I’ve fixed and re-calibrated application optimizations for better sound quality. I also added more applications to support such as popular music player and streaming apps to be optimized too.
Right now I already added new apps from iBasso / Fiio DAPs and added popular apps such as HibyMusic, Neutron, USB Audio Player, Sony Music, Poweramp, Tidal, Quboz, Spotify, YouTube, and YouTube Music. I’ll add more in coming updates based on requests.
If you like improvements in Purist ROM, you may upgrade to Enhanced / Advanced ROM for even better sound. Please read Portable Products for more details including Fidelizer Mod project with 3 modification levels and happy listening. 🙂
