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how connect debugger to ruuning mcu without reset

hi all,

I'm woking of STMF405 MCU trought a SWD (not exposing reset pin) with stlinkv2 probe
when I start with loading and reseting after load all debug is working well
but somtimes I must connect my debugger to a running mcu without reloading software and without reseting to be able to make some error debug ...
is there a solution to do that I tried to change few thing in debug settings like no reset after startup and no load at startup I've no error but I have no debug or memory view neither !
any idea ??
thank's

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