![]() ![]() ![]() My heart sunk, and I was ready to give up. Terrified that all of this work being for naught, I clicked the “Connect” button. Connecting the 4 pins just like before (VDD, VCC, SWCLK, and SWDIO), I opened STM32CubeProgrammer. The hard part done, it was time to find out if this was going to work. It ended up being a bit too much, as there was some excess solder to wick away once it was done.Īfter a couple minutes of pre-heating, the solder paste melted under the hot-air in only a few seconds, and created a beautiful, clean result. The next step was gently placing the new MCU onto the pads, and applying soldering paste (the correct thing to do this time). Using a flat soldering-iron tip to remove the excess solder and cleaning with a bit of isopropyl alcohol and a q-tip worked very nicely. The original STM32 chip held in tweezers above the board, having been removed This didn’t end up being a huge problem, it just meant there was more solder to clean from the pads. Having not fully grasped the process ahead of time, I did end up inappropriately using solder paste to desolder the original (which makes no sense, solder paste contains solder flux would have been the correct substance). ![]() Replacing the MCUĪfter researching the correct temperatures and experimenting an a piece of garbage PCB from the recycling bin, I set to work on the real thing. This job could be done with just a soldering iron, but my research indicated that a hot air rework station would be better for SMD soldering. It has 512KB of flash, which should be plenty for anything I might want to put on here. Having already determined with a fair level of certainty that the original is an STM32L series MCU, I ordered a STM32L562. Not being satisfied with giving up (and always keen to acquire a new tool), I decided to take the nuclear option: remove the original MCU and replace it with a suitable equivalent. Previous: This does not end well Hacking the Rollova: The Nuclear Option ![]()
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