diff --git a/CHANGELOG.md b/CHANGELOG.md
index 21bbcedb4..0e167b386 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,9 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
-- Added system code name annotation to 'hf felica info' and 'hf felica rqsyscode'
+- Fixed `hf mf wrbl` and `hf mfp wrbl` the ACL RO checks on 16-block sectors correct  (@team-orangeBlue)
+- Changed `hf mfp wrbl` command to check for Sector Trailer errors that could potentially lock sectors out (@team-orangeBlue)
+- Changed `hf felica info` and `hf felica rqsyscode` system code name annotation (@team-orangeBlue)
 - Added `lf relay` command where it relays between two pm3 devices over internet. Thanks to Moerno for the code! (@iceman1001)
 - Changed `hf mf acl` command to have more recognized generic configurations (@team-orangeBlue)
 - Added `hf mfp acl` command (@team-orangeBlue)
@@ -14,10 +16,10 @@ This project uses the changelog in accordance with [keepchangelog](http://keepac
 - Added `hf mfdes createdelegateapp` command (@kormax)
 - Optimized `hf iclass legbrute` throughput: replaced recursive `suc()`/`output()` cipher functions with iterative loops, added 256-entry LUT for the `select()` function eliminating redundant bit arithmetic and halving key lookups per state step, switched successor state to in-place pointer update removing per-call struct copies, added `doMAC_brute()` with byte-wise LSB-first processing and direct output bit packing eliminating all bitstream struct overhead and output reversal calls per key candidate, and replaced per-iteration 64-bit modulo progress check with a countdown counter (@antiklesys)
 - Improved `hf iclass legbrute` fixed multithreaded key-range partitioning so threads cover non-overlapping slices of the 40-bit keyspace, added ETA display, keyboard abort with resume hint, `_Atomic` correctness for shared state, `pthread_create` error handling, and thread count capped at available CPUs (@antiklesys)
-- Added wildcard support to `hf secc sim` payloads (@antiklesys)
+- Changed `hf secc sim` it nows supports wildcard to payloads (@antiklesys)
 - Added `hf secc` to build a base for simulating basic function of iclass SE config cards (@antiklesys)
-- Improved SIO parsing for `hf iclass view` based on Iceman's "Dismantling the SEOS Protocol" talk (@antiklesys)
-- Added live fc/cn update to `hf iclass tagsim` refreshing the csn with each update (@antiklesys)
+- Changed `hf iclass view` , improved SIO parsing for based on @Iceman1001's "Dismantling the SEOS Protocol" talk (@antiklesys)
+- Changed `hf iclass tagsim` added live fc/cn update to refreshing the csn with each update (@antiklesys)
 - Added `--live` option to `hf iclass lookup` command to perform a live recovery of the reader's key by simulating a tag and running the lookup command against both standard and elite dictionaries (@antiklesys)
 - Added `hf iclass tagsim` command to quickly simulate an iclass card based on facility code and card number(@antiklesys)
 - Added `-f` parameter to `hf iclass sam` command to use the sam to parse a card dump (@antiklesys)
diff --git a/client/src/cmdhfmf.c b/client/src/cmdhfmf.c
index c01ad0550..e3aeec83e 100644
--- a/client/src/cmdhfmf.c
+++ b/client/src/cmdhfmf.c
@@ -869,10 +869,16 @@ static int mf_analyse_st_block(uint8_t blockno, uint8_t *block, bool force) {
     }
 
     bool ro_detected = false;
-    uint8_t bar = mfNumBlocksPerSector(mfSectorNum(blockno));
+    //uint8_t bar = mfNumBlocksPerSector(mfSectorNum(blockno));
+    uint8_t bar = 4;
     for (uint8_t foo = 0; foo < bar; foo++) {
         if (mfReadOnlyAccessConditions(foo, &block[6])) {
-            PrintAndLogEx(WARNING, "Strict ReadOnly Access Conditions on block " _YELLOW_("%u") " detected", blockno - bar + 1 + foo);
+        // WARNING: Sectors 33+ assume ACLs apply to groups of 4 blocks, not 1 block.
+        // The code as-is is bugged and actually wastes iterations. If you have 16 blocks, it'll run all 16 but only error out like it's a 4-block sector.
+            if (blockno<128)
+                PrintAndLogEx(WARNING, "Strict ReadOnly Access Conditions on block " _YELLOW_("%u") " detected", blockno - bar + 1 + foo);
+            else
+                PrintAndLogEx(WARNING, "Strict ReadOnly Access Conditions on blocks " _YELLOW_("%u-%u") " detected", blockno - bar*4 + 1 + foo*5, blockno - bar*4 + 1 + foo*5 + 4);
             ro_detected = true;
         }
     }
diff --git a/client/src/cmdhfmfp.c b/client/src/cmdhfmfp.c
index cc47acba3..47718c363 100644
--- a/client/src/cmdhfmfp.c
+++ b/client/src/cmdhfmfp.c
@@ -809,7 +809,7 @@ static int CmdHFMFPAcl(const char *Cmd) {
                   "  ACCESS = access bytes inside sector trailer block\n"
                   "  Increment, decrement, transfer, restore is for value blocks",
                   "hf mf acl\n"
-                  "hf mf acl -d FF0780\n");
+                  "hf mf acl -d 0FFF0780\n");
 
     void *argtable[] = {
         arg_param_begin,
@@ -1180,6 +1180,49 @@ static int CmdHFMFPRdsc(const char *Cmd) {
     return PM3_SUCCESS;
 }
 
+static int mfp_analyse_st_block(uint8_t blockno, uint8_t *block, bool force) {
+
+    if (mfIsSectorTrailer(blockno) == false) {
+        return PM3_SUCCESS;
+    }
+
+    PrintAndLogEx(INFO, "Sector trailer (ST) write detected");
+
+    // ensure access right isn't messed up.
+    if (mfValidateAccessConditions(block + 6) == false || ((block[5] >> 4) != ((~block[5]) & 0xF))) {
+        PrintAndLogEx(WARNING, "Invalid Access Conditions detected, replacing with default values");
+        memcpy(block + 5, "\x0F\xFF\x07\x80\x69", 5);
+    }
+
+    bool ro_detected = false;
+    //uint8_t bar = mfNumBlocksPerSector(mfSectorNum(blockno));
+    uint8_t bar = 4;
+    for (uint8_t foo = 0; foo < bar; foo++) {
+        if (mfReadOnlyAccessConditions(foo, &block[6])) {
+        // WARNING: Sectors 33+ assume ACLs apply to groups of 4 blocks, not 1 block.
+        // The code as-is is bugged and actually wastes iterations. If you have 16 blocks, it'll run all 16 but only error out like it's a 4-block sector.
+            if (blockno<128)
+                PrintAndLogEx(WARNING, "Strict ReadOnly Access Conditions on block " _YELLOW_("%u") " detected", blockno - bar + 1 + foo);
+            else
+                PrintAndLogEx(WARNING, "Strict ReadOnly Access Conditions on blocks " _YELLOW_("%u-%u") " detected", blockno - bar*4 + 1 + foo*5, blockno - bar*4 + 1 + foo*5 + 4);
+            ro_detected = true;
+        }
+    }
+    if (ro_detected) {
+        if (force) {
+            PrintAndLogEx(WARNING, " --force override, continuing...");
+        } else {
+            PrintAndLogEx(INFO, "Exiting, please run `" _YELLOW_("hf mf acl -d %s") "` to understand", sprint_hex_inrow(&block[6], 3));
+            PrintAndLogEx(INFO, "Use `" _YELLOW_("--force") "` to override and write this data");
+            return PM3_EINVARG;
+        }
+    } else {
+        PrintAndLogEx(SUCCESS, "ST checks ( " _GREEN_("ok") " )");
+    }
+
+    return PM3_SUCCESS;
+}
+
 static int CmdHFMFPWrbl(const char *Cmd) {
     CLIParserContext *ctx;
     CLIParserInit(&ctx, "hf mfp wrbl",
@@ -1197,6 +1240,7 @@ static int CmdHFMFPWrbl(const char *Cmd) {
         arg_lit0(NULL, "nmr", "Do not expect MAC in response"),
         arg_str1("d",  "data",    "<hex>", "Data, 16 hex bytes"),
         arg_str0("k",  "key",     "<hex>", "Key, 16 hex bytes"),
+        arg_lit0(NULL, "force", "Override warnings"),
         arg_param_end
     };
     CLIExecWithReturn(ctx, Cmd, argtable, false);
@@ -1214,6 +1258,8 @@ static int CmdHFMFPWrbl(const char *Cmd) {
     uint8_t key[250] = {0};
     int keylen = 0;
     CLIGetHexWithReturn(ctx, 7, key, &keylen);
+    bool force = arg_get_lit(ctx, 8);
+  
     CLIParserFree(ctx);
 
     uint8_t keyn[2] = {0};
@@ -1239,6 +1285,16 @@ static int CmdHFMFPWrbl(const char *Cmd) {
         PrintAndLogEx(ERR, "<data> must be 16 bytes. Got %d", datainlen);
         return PM3_EINVARG;
     }
+    // Necessary checks before doing any actual computing + tag interaction
+    // Block 0 detection
+    if (blockNum == 0) {
+        PrintAndLogEx(FAILED, "Cannot write block 0 on Mifare Plus");
+        return PM3_EINVARG;
+    }
+    // ACL validity check
+    if (mfp_analyse_st_block(blockNum, datain, force) != PM3_SUCCESS) {
+        return PM3_EINVARG;
+    }
 
     uint8_t sectorNum = mfSectorNum(blockNum & 0xff);
     uint16_t uKeyNum = 0x4000 + sectorNum * 2 + (keyB ? 1 : 0);