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UHF RC system version 3-6
How to upgrade UHF system using mcuboot for V3 to V6

I recommend to use a USB interface with FTDI232 chipset, first install FTDI virtual com port driver:
this type of interface can be purchased from me, but it is actually cheaper to get from spark fun :-)
or this one:

a homemade RS232 converter can also be used if you have a normal serial COM port on your PC:
http://www.sparkfun.com/commerce/product_info.php?products_id=316 datasheet:
page 6 bottom right show you a schematic of the ICL3232 and a few capacitors and how its RS232 level lines and 3V lines are connected.

a homemade serial converter is fairly easy to make for electronic geeks :-) you must find a way to supply the converter IC with 3.3V, do not steal power from the RX
its tiny 3.3V regulator is not designed to handle extra external devices, usb converters are USB powered so no problems here.

Connect SERIAL converter cable or USB cable to the TX or RX unit you want to upgrade.
the 4 pin connector connections can be seen on the pictures

3.30 Receiver
1 = data out of receiver board, 3.3V levels
2 = data to receiver board, 3.3V levels
4 = GND

3.31 Receiver
1 = data out of receiver board, 3.3V levels
2 = data to receiver board, 3.3V levels
4 = GND

RX MK Mikro-Kopter Normal Range 601

RX NR Normal Range 600

Rx LR Long Range 402 shown, the 600 looks very much the same but is black

TX version 6 inside, note the DIP switch for the ID code, All other TX types got the SAME upgrade connector
but all pre-V6 TX versions got no DIP switch, so they need a special firmware upgrade file.. please inform this.

The upgrade connector numbers, and the new status LED

download mcuboot original version, some users might find version 1.3 works better if win7 or win8
download mcuboot version 1.3
RENAME e_x_e extension to exe, this mcuboot.exe is made using borland some PC's might need some DLL files,
in that case you will be notified, about their names, if so, inform me !! or google after them :-)

Select right comport, check your virtual comport number is right if you use USB, click OK

Browse to the HEX file you got via email, using OPEN.
remember the TX hex is for tx unit, and the RX hex is for the rx !!

File is accepted and loaded, pull down in window so you can see the black status area

mcuboot now instruct you to cycle powersupply, thay means actually you POWER UP RX or TX unit NOW

Now you should be connected to the "secret" bootloader program

Click Program and see on screen and status area checksum bytes

after 7 sec your unit is upgraded, bootloader will exit and mcuboot will say Programming done,
now check firmware is working and new features work as expected.

you MUST read about the features of your new software so you know how to use it,
you must expect to perform new bind and new store failsafe after an upgrade.

Dec 22 2023