I found this site, pakphones.com with a link for the US730. Right now, unfortunately, cloudflare can't reach the ul.to host, but if you haven't tried this one, one could hope it actually works some day.
I also found a (possibly dead) link at this site, lg-firmwares.com, though it's cookie, captcha and waiting time protected, and the download doesn't begin for me right now...
Your search string also lead me to this forum thread, where I found a relevant filename to look for: LG730ZV8_05.S8_00.P61009.cab
1-LGExtract -kdz name of flash file with kdz extention(as :LGExtract -kdz US73011b_03.S11b_03.P15107.kdz) 2-result of 1 is a file as: LG730ZV8_05.S8_00.P61009.cab 3-extract [it] by winrar here 4-LGExtract -wdb name of flash file with wdb name of flash file with dll asLGExtract -wdb US73011b_03.S11b_03.P15107.wdb US73011b_03.dll).
This lead me back to the pakphones blog, where I found these (possibly dead) links to relevant files on this page:
LG Venice LG730
Flasher LGNPST Store & Lab.zip
Firmware LG730ZV8_05.S8_00.P61009.cab [mirror]
Components & DLL LGNPST_Components_Ver_5_0_20_0.zip LGNPST_GenericModels_Ver_5_0_12_0.zip LG730_120831.rar
Service Manual EN_LG730_SVC_ENG_120919.pdf
User Manual RDL-1209-00011_LG730_Boost_UG_EN_V1.0_120925.pdf
You have probably already seen all or most of this, but maybe there's some missing puzzle piece somewhere in this information?
Note: the .cab files mentioned in this post are not URLs, even though (at least my) Lemmy client formats them as that.
I just tried this on an Ultra.cc seedbox with yt-dlp installed, and the Fintube plugin configured to the right path for that, yet when I go to Dashboard > Fintube and click the Submit button to add a video to the download, nothing happens. Can't figure out what's wrong.
Maybe Jellyfin doesn't have the necessary write permissions to write the file to that folder, but I'm not quite sure how to change those on such a seedbox, if that's the case.
Any experience with this to share? Would the Submit button usually lead to a different view, or does it just stay on that video submission screen while the download happens silently in the background? The lack of action I experience when clicking it feels a bit awkward...