Before firmware upgrade :
1. Make sure of your AK100’s battery level at least over 50%.
2. Make sure of your AK100’s memory size at least over 50 MB.
3. Don't remove the connection between PC & AK100 during transferring hex data.

※ Please back up your data in AK100 before upgrading to 1.20.
   All data will be initialized on upgrading from lower version to v1.20

◈ Newly added functions
1. Moving to Main list when you push '←' located at the top-left side of screen for 3~5 sec
   ※ Moving to upper stage as usual when you push '←' shortly( 0.5~ 1 sec).
2. Saving the playback route of music file. (Both folder type & DB type can be supported by v1.20)
   (1) Moving out user's playback route when users touch '←' after approching ' now playing ' menu ,
       Ex) If you play 'C' music file in B folder of A high rank folder ,
       1) Music files in folder B will be displayed in case of your approching 'now playing'.
       2) The information of A folder will be displayed in case of once touching '←'.

◈ Improvements
1. Blutooth function
(1) We previously recommanded you to only play less 16bit , 48kHz files for optimal sound quality ,
    but we improved it to maximum 24bit , 96kHz with keeping optimal sound quality.
    1) We recommand you to use earphone because of low sound quality of blutooth profile standards
    2) Playback of high sound quality can cause the lower playback speed or even no playback.
(2) Unified ordering process of DB & playlist under ASCII code

◈ Bug fix
1. System stabilization
   (1) Device freezing during powering ON / OFF is resolved.

2. Firmware uprade with manual
   (1) Connect AK100 with PC
   (2) Insert the latest firmware(hex) to root folder
   (3) Remove USB cable from PC
   (4) Proceeding the firmware upgrade automatically.