how to upgrade the NAV600 to a NAV900.

[luis600]

I bought latest map update 2019/2020 and apply it into my unit NAVI 600 already. After that I found this great forum and this thread about upgrading my navi unit from 600 to 900. Before I started I read posts in this thread and it made me confused. Some members said that if you use newer map update with this upgrade it may brick my unit.

1. So I ask you now if I have already inserted and applied new version of maps 2019/2020 into my unit does it means I shouldnt try this upgrade because of risk to brick my unit?
2. What if I insert my old maps 2015/2016 into my unit and downgrade maps will I than be able to apply this upgrade?
3. Steps described in first post are a little bit confusing. When screen "programing flash failed" appear instructions say this "IT WILL THEN ASK YOU TO REBOOT. REMOVE THE USB STICK. YOU WILL NOW BE IN THE BOOTLOADER 5 SCREEN" ----> does this means I need to to remove USB STICK before pressing countinue or I remove USB stick after clicking COUNTINUE and before entering into BOOTMODE. Will this procedure of rebooting automatically performed by my navigation or I have to turn it ON? Will I enter BOOTLOADER automatically by the system when I click CONTINUE?
4. Instructions then say this "INSTALL THE CDR DISK IN BOOTLOADER 5 MODE AND REBOOT BY PRESSING THE EJECT BUTTON". Why I need to press EJECT button? I thought when I insert CD (with fix files) it will be recognized automatically and proceed with installation. I think when I press EJECT button it will eject CD? THIS STEP description is really confusing. Please help me with this part "WHEN YOU HAVE THE CORRECTLY COPIED THE DISC JUST INSERT IT INTO THE NAVI
AND REBOOT BY PRESSING THE EJECT BUTTON
IT WILL THEN FLASH OFF THE INFO FROM THE DISC TO THE NAV
THIS TAKES TIME DO NOT INTERFERE TILL THIS IS COMPLETED
WHEN IT IS DONE CONFIRM INSTALL AND WAIT TILL THIS IS COMPLETED."

5. This step says: "INSERT THE NAV600 SD MAP CARD BACK INTO THE CAR
AND START THE SAT NAV IT WILL THEN REBOOT
AND FOLLOW THE ON SCREEN INSTRUCTIONS
IT WILL THEN UPDATE THE SD MAP UPDATES FROM THE SD NAVI 600 MAPS CARD
AFTER THAT HAS COMPLETED THEN TURN THE NAV ON AND OFF."

Do I need to manually do REBOOT pressing knob "OFF" "ON" or system will automatically reboots after this step?

6. "AND THEN REINSERT THE USB STICK
WHEN THE INSTALL SCREEN COMES ON THE NAVI REMOVE THE NAVI 600 SD MAP CARD
LEAVING THE USB STICK IN PLACE
AND THEN FOLLOW THE ON SCREEN INSTRUCTIONS AND THIS TIME IT WILL INSTALL TILL 100% CORRECTLY.

WHEN COMPLETED REMOVE THE USB STICK AND REBOOT THE NAVI
THEN INSTALL THE NAVI 600 SD MAP CARD AND TURN THE NAVI OFF AND ON
THE UPDATE IS NOW COMPLETE."

When system installation is completed this time to 100% correctly will it promt me to restasrt/reboot system by pressing COUNTINUE BUTTON? Do I need to remove usb stick before pressing countinue button? Or I need to manually reboot by pressing big knob button? Do I need to turn off navi and then insert SD and than TURN on the navi OR system will automatically reboots and than I insert SD and turn system off/on.

Pls help me I know I am confused but understand me I dont want to finish with bricked devicde because I dont have money to replace another. Thank you