Hello,
I have a Meraki MR33 that was obtain through a course ... and I never used.
Now when I want to use, I see I need a subscription to use, but... I found OpenWrt it's supported.
I do not found a step by step installing process ... I found just https://openwrt.org/toh/meraki/mr33 and a short video on youtube.. but there are missing detail about how to install OpenWrt on MR33.
Can some one help me? Please 
the instructions stored in the google drive link looked pretty complete to me
Now I see, I must to install Python on my Win10 and from there to execute commands.
From that PDF file it's telling me for step 4:
Starting ubootwrite on the PC
(Windows users please follow User Story: Flashing with Windows)
but when I click on User Story: Flashing with Windows, no link or other page it's opening. (can I ignor this?)
I'm not an expert on CLI... I'm more GUI learning.
Can you find it when you search the PDF for "User story"?
I'm a noobie 
as I say.. I'm more GUI not CLI
then you should probably stay away, until you feel more comfortable using CLI ... 
Hi again,
I succeed to install python, tftp client on, but...
Z:\MR33>python ubootwrite.py --serial=COM9 --write=mr33-uboot.bin
File "Z:\MR33\ubootwrite.py", line 34
while True:
TabError: inconsistent use of tabs and spaces in indentation
I'm stuck to this.
How did you dl/copy the .py from github ?
Directly from Google Drive
https://drive.google.com/drive/folders/1goSM3qgRjna2DFZbhrlLAyfQr4iBwqr_
Click right >> Download
There it's another way?
the script you got from google drive runs with python 2, as far as I know. either install python 2, or use the method described here working with python3 (and Tera Term): https://forum.archive.openwrt.org/viewtopic.php?id=70514&p=2 post #43.