====== Crystal Sky Rooting ======
Opcode, Hostile and Lord's Working Root

https://github.com/Opcodeffm/csroot

This has been tested on an CrystalSky 7.85 and 5.5, System Versions
  * v02.02.09.00
  * v02.04.02.00
  * v-2.05.00.00 (09/02/2018)
  * V02.06.03.00 (12/04/2018)
  * v02.06.06.00 (12/23/2018)
  * v03.00.02.00 (12/09/2019) - **CAUTION** - you will NOT be able to downgrade from this firmware once installed.

__**WARNING**__ If you install firmware v3.0.2.0 you will not be able to install firechain and thus will NOT be able to install the google play store.

Rooting v3.0.2.0 is still possible! Source https://nolimitdronez.com/boards/topic/39/howto-rooting-dji-crystal-sky/page/5#5180
The only thing I noticed is that adb drivers on Windows are now not compatible
with v3.0.2.0, because the new image reports a different USB VID/PID codes.
So on Win7/Win10 you won't see attached devices on the USB adb bridge.
Use a Linux virtual machine for that (Virtualbox) and the problem is sovled.



{{:howto:aaaot1j7dm.png?400|}}



It has been confirmed, the following google play store install will **NOT** work on v03.00.02.00.



====== Google Play Store ======

To make Google Play Store work, first you need root!

After that, you need a flashing tool and the needed zip which contains the Play Store, Framework etc.
The flashing tool can be downloaded here: https://www.apkmirror.com/apk/chainfire/flashfire/
The needed zip can be downloaded here: http://opengapps.org/
Choose Platform: "ARM" Android: "5.1" Variant: "pico"

  * Install (sideload) flashfire
  * Give flashfire su, if asked
  * Copy the zip (i.e. open_gapps-arm-5.1-pico-20170811.zip) to an sd card, plug it in the CS sd1 slot
  * In flashfire, tap the "+" sign on the right hand corner.
  * Choose "Flash ZIP or OTA"
  * Tap on top of the filebrowser to change to "Filesystem root"
  * Navigate to "mnt/external_sd1"
  * Choose your zip file
  * Leave "Auto-mount" and "Mount/system read/write" unchecked
  * Hit the checkmark and there you go
  * After several reboots, you will be greeted with the setup assistant.

Step through it, make your settings and thats it.

****WARNING!**
**
Triple Check the chosen Platform, Android Version and Variant to avoid flashing wrong software, which could brick your device. Execute the steps carefully and you should be good.

This has been tested on an CrystalSky 7.85, System Version 02.02.08.01, 02.02.09.00, 02.04.02.00, 2.06.06.00. and v03.00.02.00

====== Default Wifi regulatory domain ======

This is mostly for Spark users, maybe for Mavic Air (I don't have one so I can't tell)

The Wifi regulatory domain (country code) influence the allowed channels in each frequency.
Especially many databases including CrystalSky are NOT up to date, and for exemple in Europe do not allow the 149 and above 5.8 GHz channels that are requiered to use Spark in 2.4 Ghz without OTG (in that case the RC to CS link would be in 5.8 GHz)

One solution is to manually set the regulatory domain with shell wifi command (use a terminal application)

su -c "iw reg set "US" (need root)

But i found that when doing transitions from 2.4 to 5.8 there could be a time where the devices is going back to default regdom, and get stuck because the new channel can not be seen after switching in the GO4 App.

Another solution is to change the default regdom that was assigned by CS at setup. You also need root and to edit the file
/data/property/persist.country.code and change whatever value is inside by 8348 which codes for "US"
5can use e.g. ES Explorer - paid version - to do that directly on the rooted CS)

The full CS country 2 letters code to this 4 hex code is : 

^ Country Code ^ Hex Code ^ Country Name ^ 
^AL|8008|ALBANIA |
^DZ|800C|ALGERIA |
^AR|8020|ARGENTINA |
^AM|8033|ARMENIA |
^AW|8215|ARUBA |
^AU|8024|AUSTRALIA |
^AT|8028|AUSTRIA |
^AZ|801f|AZERBAIJAN |
^BH|8030|BAHRAIN |
^BD|8032|BANGLADESH |
^BB|8034|BARBADOS |
^BY|8070|BELARUS |
^BE|8038|BELGIUM |
^BZ|8054|BELIZE |
^BO|8044|BOLVIA |
^BA|8046|BOSNIA |
^BR|804C|BRAZIL |
^BN|8060|BRUNEI |
^BG|8064|BULGARIA |
^KH|8074|CAMBODIA |
^CA|807C|CANADA |
^CA|9389|CANADA_AP |
^CL|8098|CHILE |
^CN|809C|CHINA |
^CO|80AA|COLOMBIA |
^CR|80BC|COSTA |
^HR|80BF|CROATIA |
^CY|80C4|CYPRUS |
^CZ|80CB|CZECH |
^DK|80D0|DENMARK |
^DO|80D6|DOMINICAN |
^EC|80DA|ECUADOR |
^EG|8332|EGYPT |
^SV|80DE|EL |
^EE|80E9|ESTONIA |
^FI|80F6|FINLAND |
^FR|80FA|FRANCE |
^F2|80FF|FRANCE2 |
^GE|810C|GEORGIA |
^DE|8114|GERMANY |
^GR|812C|GREECE |
^GL|8130|GREENLAND |
^GD|8134|GRENADA |
^GU|813C|GUAM |
^GT|8140|GUATEMALA |
^HT|814C|HAITI |
^HN|8154|HONDURAS |
^HK|8158|HONG |
^HU|815C|HUNGARY |
^IS|8160|ICELAND |
^IN|8164|INDIA |
^ID|8168|INDONESIA |
^IR|816C|IRAN |
^IE|8174|IRELAND |
^IL|8178|ISRAEL |
^IT|817C|ITALY |
^JM|8184|JAMAICA |
^JP|8188|JAPAN |
^JO|8190|JORDAN |
^KZ|818E|KAZAKHSTAN |
^KE|8194|KENYA |
^KP|8198|NORTH |
^KR|819A|KOREA_REPUBLIC |
^K2|819B|KOREA |
^K3|819C|KOREA |
^KW|819E|KUWAIT |
^LV|81AC|LATVIA |
^LB|81A6|LEBANON |
^LI|81B6|LIECHTENSTEIN |
^LT|81B8|LITHUANIA |
^LU|81BA|LUXEMBOURG |
^MO|81BE|MACAU |
^MK|8327|MACEDONIA |
^MY|81CA|MALAYSIA |
^MT|81D6|MALTA |
^MX|81E4|MEXICO |
^MC|81EC|MONACO |
^MA|81F8|MOROCCO |
^NP|820C|NEPAL |
^NL|8210|NETHERLANDS |
^AN|8212|NETHERLANDS_ANTILLES |
^NZ|822A|NEW_ZEALAND |
^NO|8242|NORWAY |
^OM|8200|OMAN |
^PK|824A|PAKISTAN |
^PA|824F|PANAMA |
^PE|825C|PERU |
^PH|8260|PHILIPPINES |
^PL|8268|POLAND |
^PT|826C|PORTUGAL |
^PR|8276|PUERTO_RICO |
^QA|827A|QATAR |
^RO|8282|ROMANIA |
^RU|8283|RUSSIA |
^RW|8286|RWANDA |
^SA|82AA|SAUDIA |
^ME|81F3|MONTENEGRO |
^RS|82B0|SERBIA |
^SG|82BE|SINGAPORE |
^SK|82BF|SLOVAKIA |
^SI|82C1|SLOVENIA |
^ZA|82C6|SOUTH |
^ES|82D4|SPAIN |
^LK|8090|SRI |
^SE|82F0|SWEDEN |
^CH|82F4|SWITZERLAND |
^SY|82F8|SYRIA |
^TW|809E|TAIWAN |
^TH|82FC|THAILAND |
^TT|830C|TRINIDAD |
^TN|8314|TUNISIA |
^TR|8318|TURKEY |
^UG|8320|UGANDA |
^AE|8310|UNITED |
^UA|8324|UKRAINE |
^GB|833A|UNITED_KINGDOM |
^US|8348|UNITED_STATES |
^US|8349|UNITED |
^PS|834A|UNITED_STATES_PS |
^UY|835A|URUGUAY |
^UZ|835C|UZBEKISTAN |
^VE|835E|VENEZUELA |
^VN|82C0|VIETNAM |
^YE|8377|YEMEN |
^ZW|82CC|ZIMBABWE|