Timer doesn't work (STM32F767 + TIM3)

Hello. I have this init TIM3:

void Start_Timer_3(void)
{
	LL_TIM_InitTypeDef TIM_InitStruct;
 
	LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_TIM3);
 
	NVIC_SetPriority(TIM3_IRQn, 3);
	NVIC_EnableIRQ(TIM3_IRQn);
 
 // 50MHz clock
	// 1000 Hz, upcounting 32-bit
	// 1000 = ( 50000000 / (Prescaler+1))
	TIM_InitStruct.Prescaler = (uint16_t)50000 - 1;
	TIM_InitStruct.CounterMode = LL_TIM_COUNTERMODE_UP;
	TIM_InitStruct.Autoreload = 0xFFFFFFFFU;
	TIM_InitStruct.ClockDivision = LL_TIM_CLOCKDIVISION_DIV1;
	TIM_InitStruct.RepetitionCounter = (uint8_t)0x00U;
 
 LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_TIM3);
 LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_TIM3);
 
	LL_TIM_Init(TIM3, &TIM_InitStruct);
 
	LL_TIM_ClearFlag_UPDATE(TIM3);
	LL_TIM_EnableIT_UPDATE(TIM3);
 
	LL_TIM_EnableCounter(TIM3);
}

And here is my Handler:

void TIM3_IRQHandler(void)
{
	LL_TIM_ClearFlag_UPDATE(TIM3);
	// breakpoint atc.... here
}

And my handler isn't working. Any idea, why? I try everything.