How do I troubleshoot my Godox firmware updating process?

I’m trying to update my Godox flash’s firmware, but it’s not working, and I can’t figure out why. I’ve successfully installed the firmware update application, I’ve connected my flash to the computer with a USB cable, and loaded the firmware file into the software, but it just won’t connect to the device and perform the upgrade.

I think I’ve got everything set up properly, and I’ve followed the PDF documentation that was in the update application archive as best I can. What should I check?

Is Godox TT600 perfect flash for me?

I did some research regarding off-brand flashes and I think TT600 (I would order 3 of those) would fit me perfect for my needs. I would use it mostly for product/advertisement photography with light stands/softboxes/umbrellas, and also for portraits. I use bunch of different brand gear (mostly Canon, but also Sony, Nikon and Fujifilm), I don’t mind it doesn’t have TTL, it supports HSS with corresponding trigger (I would go for Godox XPro Canon version), it has built in RF receiver and it’s output power can be controlled via transmitter, it’s not brand specific so it can be mounted on any hotshoe if I would use it on camera. And also it’s pretty cheap (56£).

Other option would be Yongnuo 560-III which does it all except it doesn’t support HSS if I’m not wrong.

I want to know if I’m missing something or if there is some other-brand flash that would suit my needs better within same price range?

Universal wireless radio transmitter that can trigger Elinchrom studio strobes, Yongnuo speedlites and Godox flash

I have a pair of Elinchrom D-Lite-2 IT 200Ws studio strobes. The strobes have built-In Skyport wireless receivers and the set came with a Elinchrom Skyport ECO transmitter. This transmitter broke during my latest photoshoot so I am in the market for a new transmitter.

I also have two Yongnuo YN600EX-RT II Speedlites which have built-in receivers compatible with Canon’s 2.4 GHz radio flash trigger system and E-TTL / E-TTL II metering and a Yongnuo YN-E3-RT Speedlite transmitter.

In the near future, I might also buy a Godox AD200 flash.

I’m searching for a universal wireless radio transmitter that can trigger all these different branded studio strobes and flashes from a Canon 6D camera.

What my research has learned already:

Elinchrom Transmitter PRO

The Elinchrom Transmitter PRO is compatible with the three previous generations of flash units (including the EL-Skyport Transceiver RX module for Style RX, Digitial RX, and Ranger RX systems, the integrated EL-Skyport modules for D-Lite RX, BRX, ELC Pro HD and ELB series.).

I have the non-RX version of the D-lite kit, so not completely sure if this is compatible. No word on compatibility with the Yongnuo and Godox flashes.

Radiopopper JrX

The JrX Transmitter is compatible with any camera body with a standard hotshoe. The JrX Receiver is compatible with most all studio strobes and handheld flashes with appropriate sync cable. JrX Receivers are shipped with 3.5mm cable, 2.5mm and 1/4 inch sync adapters.

This seems to be compatible with my setup, but it seems that I would need to buy separate receiver units for my strobes and flashes, even though they have built-in receivers.

Any suggestion what would be the best transmitter for my use case? I’m open to use other brands or models than the transmitters listed above.

Godox V860II Guide Number at different zoom steps

Is there any specification for the Guide Number at different zoom steps for the Godox V860II flash? Some manufacturers make this information available. I couldn’t find this at the Godox website, nor I got any reply from their support page. If not, is there a way I can manually calculate the Guide Number decrease from 200mm to 20mm (this flash zoom coverage)? Thank you.