I faced another modding disaster. This time it is BLF LT1.
Plan was simple - change 5000K LH351D with CSLNM1.FY from Convoy store (orange W1 osram leds).
Led reflow was successful. Checked with multimeter, and leds work.
While putting everything together I tore off positive contact pad from MCPCB and now when I put batteries in there is no button led indication (no power to driver?) I have done nothing to driver. Just desoldered 3 wires from mcpcb.
Need to figure out how to fix mcpcb contact pad and why power button stopped working…
Update: I soldered mcpcb back, but cant get light to work. When connecting batteries light does not work. When connecting to charger, light randomly blinks main leds and green button led randomly blinks. I cant believe I somehow damaged driver 
Update2: There was probably some internal short circuit between button wires. Everything works now. Will post some pictures later.