@skywatch - great, I will have a look.
The question im asking myself now is if AC voltage is the only parameter you need to know when selecting a MOV. I had a comment here suggesting there was more to it.
Edit: Something like this? https://www.electronicdesign.com/power/select-right-varistors-overvoltage-circuit-protection
@skywatch i was looking for a good video about varistors - mostly about finding the right one for my AC rating. Do you happen to know one? All i found was "this is how a mov functions"-videos.
@tomg what I've read some people seem to dislike varistors just because the can fail causing a short. If you don't have a fuse before you will have a fire. Have a look on Wikipedia under hazards.
Offcourse with a fuse this seems to be a good tool to avoid surge damage with a MOV but I guess selecting it's values are crusial.
I'm don't have knowledge enough and it's been pointed out to me that selecting the varistor values and specs are very important. Unfortunately I haven't got that far in my readings yet...
Edit: myself are also using the HLK with MOV. Even one outside (under roof) and it's been working great for a while... so offcourse there might be a chance it was just an unlucky event.
@yveaux nothing that I can post here unfortunately... only a ladder for my cat 
non automated.
Today I had the ladder so I could get on the roof so while there I changed batteries on my rain node.
@mister_ik you can always use wired to repair the damaged tracks.
@mister_ik - well, 2-4 weeks more or less unless you reprogram the fuses and bootloader.
@prakhar-birla - well the idea with MysX is that the pin-order is fixed so you can attach any daugherboard to it. If you start mixing the pins around you will not be able to transfer a daugherboard from one motherboard to another since they will be different. Im not sure how MysX would translate to other MCU but other have digital and analog pins as well - so it would be most possible to connect MysX to other mcu.
About the external interrupt you are right, there are 2 on the atmega328. On my Nrf24l01+ version you can use D2 as an interrupt but since the RFM69 radio uses this pin you can not on this version. D3 is your only choise and if you need more you might have to create an external circuit.
As I said, I havent had time to look over SPI flash instructions yet. I havent even tried it - this is a user request from this forum. You can search this forum for more information - like this: https://forum.mysensors.org/topic/3160/ota-flash-types-for-mysensors/
@prakhar-birla Hi!
The reason is that MysX is a fixed connector. This way you can make daughterboards. If the pins would be inconsistent it would not work. You can use these pins (A0 + D2) if you dont use it for radio or battery measurment.
I havent had time to make instructions for the flash memory, but there are several others on this site which have made that. Look around for @scalz work for example on openhardware.io
