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Are there instructions on how to modify TFM-561U to have line voltage inducer internal? I’m very competent with soldering and desoldering and have proper tools.

Thanks

assuming its chipset is similar to the dell and lenovo modems, it basically just requires a boost board and you solder that in place of a battery connector, then the rest is pretty much the same as a standard LVI, just internally instead of in the cord itself. that is a bit of an oversimplification but there was a thread with people showing their attempts on here a while back. viewtopic.php?t=10795