Any tool claiming to "convert 3G to 4G via software" is either a scam, a mislabeled driver pack, or a virus.
You cannot rewrite a 3G chip’s firmware to suddenly speak OFDMA. It’s like trying to update the firmware on a toaster to turn it into a microwave. The physical transistors aren't there. 3g modem to 4g converter software
Have an old 3G modem lying around? Turn it into a local SMS gateway instead. That’s a software project that actually works. (Search for gammu-smsd and your modem model.) Any tool claiming to "convert 3G to 4G
A 3G modem (UMTS/HSPA) contains a specific and a radio frequency (RF) front-end tuned to operate between 850 MHz and 2100 MHz using W-CDMA modulation. The physical transistors aren't there
Scour the corners of Reddit, YouTube comments, or dubious driver websites, and you will find a persistent ghost: “3G to 4G converter software.”
Many 3G modems sold in 2012–2015 were actually that supported 42.2 Mbps downlink. Some manufacturers artificially locked certain frequency bands via firmware to segment markets.