diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c
index c5bcc8d4..bb73d5b7 100644
--- a/armsrc/iso14443a.c
+++ b/armsrc/iso14443a.c
@@ -2206,9 +2206,12 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
 
 	if (MF_DBGLEVEL >= 1)	{
 		if (!_7BUID) {
-			Dbprintf("4B UID: %02x%02x%02x%02x",rUIDBCC1[0] , rUIDBCC1[1] , rUIDBCC1[2] , rUIDBCC1[3]);
+			Dbprintf("4B UID: %02x%02x%02x%02x", 
+				rUIDBCC1[0], rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3]);
 		} else {
-			Dbprintf("7B UID: (%02x)%02x%02x%02x%02x%02x%02x%02x",rUIDBCC1[0] , rUIDBCC1[1] , rUIDBCC1[2] , rUIDBCC1[3],rUIDBCC2[0],rUIDBCC2[1] ,rUIDBCC2[2] , rUIDBCC2[3]);
+			Dbprintf("7B UID: (%02x)%02x%02x%02x%02x%02x%02x%02x",
+				rUIDBCC1[0], rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3],
+				rUIDBCC2[0], rUIDBCC2[1] ,rUIDBCC2[2], rUIDBCC2[3]);
 		}
 	}
 
@@ -2318,10 +2321,13 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
 
 				// test if auth OK
 				if (cardRr != prng_successor(nonce, 64)){
-					if (MF_DBGLEVEL >= 2)	Dbprintf("AUTH FAILED. cardRr=%08x, succ=%08x",cardRr, prng_successor(nonce, 64));
+					if (MF_DBGLEVEL >= 2) Dbprintf("AUTH FAILED for sector %d with key %c. cardRr=%08x, succ=%08x",
+							cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B',
+							cardRr, prng_successor(nonce, 64));
 					// Shouldn't we respond anything here?
 					// Right now, we don't nack or anything, which causes the
 					// reader to do a WUPA after a while. /Martin
+					// -- which is the correct response. /piwi
 					cardSTATE_TO_IDLE();
 					LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE);
 					LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE);
@@ -2335,7 +2341,9 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
 				EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
 				LED_C_ON();
 				cardSTATE = MFEMUL_WORK;
-				if (MF_DBGLEVEL >= 4)	Dbprintf("AUTH COMPLETED. sector=%d, key=%d time=%d", cardAUTHSC, cardAUTHKEY, GetTickCount() - authTimer);
+				if (MF_DBGLEVEL >= 4)	Dbprintf("AUTH COMPLETED for sector %d with key %c. time=%d", 
+					cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B',
+					GetTickCount() - authTimer);
 				break;
 			}
 			case MFEMUL_SELECT2:{
@@ -2393,12 +2401,12 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
 					crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY));
 
 					if (!encrypted_data) { // first authentication
-						if (MF_DBGLEVEL >= 2) Dbprintf("Reader authenticating for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY  );
+						if (MF_DBGLEVEL >= 4) Dbprintf("Reader authenticating for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY  );
 
 						crypto1_word(pcs, cuid ^ nonce, 0);//Update crypto state
 						num_to_bytes(nonce, 4, rAUTH_AT); // Send nonce
 					} else { // nested authentication
-						if (MF_DBGLEVEL >= 2) Dbprintf("Reader doing nested authentication for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY );
+						if (MF_DBGLEVEL >= 4) Dbprintf("Reader doing nested authentication for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY );
 						ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); 
 						num_to_bytes(ans, 4, rAUTH_AT);
 					}
@@ -2429,9 +2437,9 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
 
 				if(receivedCmd[0] == 0x30 // read block
 						|| receivedCmd[0] == 0xA0 // write block
-						|| receivedCmd[0] == 0xC0
-						|| receivedCmd[0] == 0xC1
-						|| receivedCmd[0] == 0xC2 // inc dec restore
+						|| receivedCmd[0] == 0xC0 // inc
+						|| receivedCmd[0] == 0xC1 // dec
+						|| receivedCmd[0] == 0xC2 // restore
 						|| receivedCmd[0] == 0xB0) { // transfer
 					if (receivedCmd[1] >= 16 * 4) {
 						EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
@@ -2447,7 +2455,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
 				}
 				// read block
 				if (receivedCmd[0] == 0x30) {
-					if (MF_DBGLEVEL >= 2) {
+					if (MF_DBGLEVEL >= 4) {
 						Dbprintf("Reader reading block %d (0x%02x)",receivedCmd[1],receivedCmd[1]);
 					}
 					emlGetMem(response, receivedCmd[1], 1);
@@ -2463,7 +2471,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
 				}
 				// write block
 				if (receivedCmd[0] == 0xA0) {
-					if (MF_DBGLEVEL >= 2) Dbprintf("RECV 0xA0 write block %d (%02x)",receivedCmd[1],receivedCmd[1]);
+					if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0xA0 write block %d (%02x)",receivedCmd[1],receivedCmd[1]);
 					EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
 					cardSTATE = MFEMUL_WRITEBL2;
 					cardWRBL = receivedCmd[1];
@@ -2471,7 +2479,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
 				}
 				// increment, decrement, restore
 				if (receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2) {
-					if (MF_DBGLEVEL >= 2) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]);
+					if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]);
 					if (emlCheckValBl(receivedCmd[1])) {
 						if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate on block, but emlCheckValBl failed, nacking");
 						EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
@@ -2489,7 +2497,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
 				}
 				// transfer
 				if (receivedCmd[0] == 0xB0) {
-					if (MF_DBGLEVEL >= 2) Dbprintf("RECV 0x%02x transfer block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]);
+					if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x transfer block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]);
 					if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd[1]))
 						EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
 					else
diff --git a/client/cmdhfmf.c b/client/cmdhfmf.c
index d9fd8092..6075db53 100644
--- a/client/cmdhfmf.c
+++ b/client/cmdhfmf.c
@@ -1194,7 +1194,7 @@ int CmdHF14AMf1kSim(const char *Cmd)
 		PrintAndLog("           n    (Optional) Automatically exit simulation after <numreads> blocks have been read by reader. 0 = infinite");
 		PrintAndLog("           i    (Optional) Interactive, means that console will not be returned until simulation finishes or is aborted");
 		PrintAndLog("           x    (Optional) Crack, performs the 'reader attack', nr/ar attack against a legitimate reader, fishes out the key(s)");
-		PrintAndLog("           sample: hf mf sim 0a0a0a0a ");
+		PrintAndLog("           sample: hf mf sim u 0a0a0a0a ");
 		return 0;
 	}
 	uint8_t pnr = 0;
@@ -1260,8 +1260,10 @@ int CmdHF14AMfDbg(const char *Cmd)
 		PrintAndLog("Usage:  hf mf dbg  <debug level>");
 		PrintAndLog(" 0 - no debug messages");
 		PrintAndLog(" 1 - error messages");
-		PrintAndLog(" 2 - all messages");
-		PrintAndLog(" 4 - extended debug mode");
+		PrintAndLog(" 2 - plus information messages");
+		PrintAndLog(" 3 - plus debug messages");
+		PrintAndLog(" 4 - print even debug messages in timing critical functions");
+		PrintAndLog("     Note: this option therefore may cause malfunction itself");
 		return 0;
 	}	
 
@@ -1473,8 +1475,8 @@ int CmdHF14AMfECFill(const char *Cmd)
 	uint8_t keyType = 0;
 
 	if (strlen(Cmd) < 1 || param_getchar(Cmd, 0) == 'h') {
-		PrintAndLog("Usage:  hf mf efill <key A/B>");
-		PrintAndLog("sample:  hf mf efill A");
+		PrintAndLog("Usage:  hf mf ecfill <key A/B>");
+		PrintAndLog("sample:  hf mf ecfill A");
 		PrintAndLog("Card data blocks transfers to card emulator memory.");
 		PrintAndLog("Keys must be laid in the simulator memory. \n");
 		return 0;