Now i have actually made som progress!! 
The RF Nano and Arduino 33IOT dident work with the code and latest RF24 lib.
The setup i´m trying now is:
Arduino UNO with 5-3V NRF adapter and NRF24LO1
Arduino Nano Mega328P ( OLD bootloader ) with 5-3V NRF adapter and NRF24LO1.
I have tried supplying power from external 5V to the 5-3V Nrf Adapter.
The comunicating dosent look so stable.
When i hold both NRF at the same time the communication is stable!!
I have tried putting an GND wire between the NRF and arduinos with no luck.
The RX code:
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
// UNO
#define CE_PIN 9
#define CSN_PIN 10
const byte thisSlaveAddress[5] = {'R','x','A','A','A'};
RF24 radio(CE_PIN, CSN_PIN);
char dataReceived[10]; // this must match dataToSend in the TX
bool newData = false;
//===========
void setup() {
Serial.begin(9600);
Serial.println("SimpleRx Starting");
radio.begin();
radio.setDataRate( RF24_250KBPS );
radio.openReadingPipe(1, thisSlaveAddress);
radio.startListening();
}
//=============
void loop() {
getData();
showData();
}
//==============
void getData() {
if ( radio.available() ) {
radio.read( &dataReceived, sizeof(dataReceived) );
newData = true;
}
}
void showData() {
if (newData == true) {
Serial.print("Data received ");
Serial.println(dataReceived);
newData = false;
}
}
TX Code:
// SimpleTx - the master or the transmitter
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
// Nano oldbootloader
#define CE_PIN 9
#define CSN_PIN 10
const byte slaveAddress[5] = {'R','x','A','A','A'};
RF24 radio(CE_PIN, CSN_PIN); // Create a Radio
char dataToSend[10] = "Message 0";
char txNum = '0';
unsigned long currentMillis;
unsigned long prevMillis;
unsigned long txIntervalMillis = 1000; // send once per second
void setup() {
Serial.begin(9600);
Serial.println("SimpleTx Starting");
radio.begin();
radio.setDataRate( RF24_250KBPS );
radio.setRetries(3,5); // delay, count
radio.openWritingPipe(slaveAddress);
}
//====================
void loop() {
currentMillis = millis();
if (currentMillis - prevMillis >= txIntervalMillis) {
send();
prevMillis = millis();
}
}
//====================
void send() {
bool rslt;
rslt = radio.write( &dataToSend, sizeof(dataToSend) );
// Always use sizeof() as it gives the size as the number of bytes.
// For example if dataToSend was an int sizeof() would correctly return 2
Serial.print("Data Sent ");
Serial.print(dataToSend);
if (rslt) {
Serial.println(" Acknowledge received");
updateMessage();
}
else {
Serial.println(" Tx failed");
}
}
//================
void updateMessage() {
// so you can see that new data is being sent
txNum += 1;
if (txNum > '9') {
txNum = '0';
}
dataToSend[8] = txNum;
}
Serial Monitor:
15:36:40.495 -> Data Sent Message 4 Tx failed
15:36:41.532 -> Data Sent Message 4 Tx failed
15:36:42.520 -> Data Sent Message 4 Tx failed
15:36:43.553 -> Data Sent Message 4 Tx failed
15:36:44.588 -> Data Sent Message 4 Tx failed
15:36:45.579 -> Data Sent Message 4 Tx failed
15:36:46.568 -> Data Sent Message 4 Tx failed
15:36:47.604 -> Data Sent Message 4 Tx failed
15:36:48.592 -> Data Sent Message 4 Tx failed
15:36:49.625 -> Data Sent Message 4 Acknowledge received
15:36:50.614 -> Data Sent Message 5 Acknowledge received
15:36:51.646 -> Data Sent Message 6 Tx failed
15:36:52.636 -> Data Sent Message 6 Tx failed
15:36:53.670 -> Data Sent Message 6 Tx failed
15:36:54.704 -> Data Sent Message 6 Tx failed
15:36:55.693 -> Data Sent Message 6 Tx failed
15:36:56.687 -> Data Sent Message 6 Acknowledge received
15:36:57.724 -> Data Sent Message 7 Tx failed
15:36:58.714 -> Data Sent Message 7 Acknowledge received
15:36:59.749 -> Data Sent Message 8 Tx failed
15:37:00.781 -> Data Sent Message 8 Tx failed
15:37:01.773 -> Data Sent Message 8 Tx failed
15:37:02.806 -> Data Sent Message 8 Tx failed
15:37:03.795 -> Data Sent Message 8 Tx failed
15:37:04.827 -> Data Sent Message 8 Tx failed
15:37:05.815 -> Data Sent Message 8 Tx failed
15:37:06.849 -> Data Sent Message 8 Tx failed
15:37:07.837 -> Data Sent Message 8 Tx failed
15:37:08.873 -> Data Sent Message 8 Tx failed
15:37:09.906 -> Data Sent Message 8 Tx failed
15:37:10.898 -> Data Sent Message 8 Tx failed
15:37:11.931 -> Data Sent Message 8 Tx failed
15:37:12.921 -> Data Sent Message 8 Tx failed
15:37:13.954 -> Data Sent Message 8 Tx failed
15:37:14.987 -> Data Sent Message 8 Tx failed
15:37:15.977 -> Data Sent Message 8 Tx failed
15:37:17.009 -> Data Sent Message 8 Tx failed
15:37:18.002 -> Data Sent Message 8 Tx failed
15:37:18.989 -> Data Sent Message 8 Acknowledge received
15:37:20.023 -> Data Sent Message 9 Tx failed
15:37:21.057 -> Data Sent Message 9 Tx failed
15:37:22.045 -> Data Sent Message 9 Tx failed
15:37:23.083 -> Data Sent Message 9 Tx failed
15:37:24.073 -> Data Sent Message 9 Tx failed
15:37:25.106 -> Data Sent Message 9 Tx failed
15:37:26.094 -> Data Sent Message 9 Acknowledge received
15:37:27.132 -> Data Sent Message 0 Tx failed
15:37:28.123 -> Data Sent Message 0 Acknowledge received
15:37:29.156 -> Data Sent Message 1 Tx failed
15:37:30.146 -> Data Sent Message 1 Tx failed
15:37:31.178 -> Data Sent Message 1 Tx failed
15:37:32.217 -> Data Sent Message 1 Tx failed
15:37:33.205 -> Data Sent Message 1 Tx failed
15:37:34.239 -> Data Sent Message 1 Tx failed
15:37:35.227 -> Data Sent Message 1 Tx failed
15:37:36.260 -> Data Sent Message 1 Tx failed
15:37:37.250 -> Data Sent Message 1 Tx failed
15:37:38.285 -> Data Sent Message 1 Tx failed
15:37:39.275 -> Data Sent Message 1 Tx failed
15:37:40.308 -> Data Sent Message 1 Tx failed
15:37:41.343 -> Data Sent Message 1 Tx failed
15:37:42.331 -> Data Sent Message 1 Tx failed
15:37:43.319 -> Data Sent Message 1 Acknowledge received
15:37:44.351 -> Data Sent Message 2 Tx failed
Serial Monitor:
16:16:16.972 -> Data received Message 8
16:16:18.009 -> Data received Message 8
16:16:27.144 -> Data received Message 8
16:16:28.132 -> Data received Message 9
16:16:29.127 -> Data received Message 0
16:16:30.161 -> Data received Message 1
16:16:31.152 -> Data received Message 2
16:16:32.140 -> Data received Message 3
16:16:33.127 -> Data received Message 4
16:16:34.165 -> Data received Message 5
16:16:35.154 -> Data received Message 6
16:16:36.142 -> Data received Message 7
16:16:43.244 -> Data received Message 8
Best Regards
Andreas