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uvk5_pc_probe_interval_ms() reads UVK5_PC_PROBE_MS and falls back to 100, so existing probe runs are unchanged. At 2 ms a launch gives 468 samples in about 0.94 s and exactly one of them is inside the 4 KiB overlay: the app lives for roughly 2 ms, not 100. The trace settles two things and adds one. The loader copies and jumps (the single overlay sample; a 16-byte app that calls nothing stays there forever). The sector-cache overwrite is dead: the flash log's last transaction for the run is the app's own code load (addr=103000 len=2408) and nothing follows it, no font read included. New: after the app dies the firmware loops inside its own flash (PCs near 0x08005118/0x08005122/0x08005248) with zero flash reads and no key response at all -- F then 7 no longer opens the menu and an explicit MENU down/up changes nothing -- so the launcher or its fault path is wedged.