diff --git a/README.markdown b/README.markdown
index 6891fb8..6d01e25 100644
--- a/README.markdown
+++ b/README.markdown
@@ -2,7 +2,7 @@
 
 **Very experimental! No compatibility guarantees!**
 
-Ghidra version: 9.1 (git master)
+Ghidra version: 9.0.4
 
 ![Tetris disassembly](screenshot.png)
 
diff --git a/src/main/java/fi/gekkio/ghidraboy/GameBoyLoader.java b/src/main/java/fi/gekkio/ghidraboy/GameBoyLoader.java
index dfd75f3..fdf2014 100644
--- a/src/main/java/fi/gekkio/ghidraboy/GameBoyLoader.java
+++ b/src/main/java/fi/gekkio/ghidraboy/GameBoyLoader.java
@@ -13,10 +13,10 @@
 // limitations under the License.
 package fi.gekkio.ghidraboy;
 
-import ghidra.app.util.MemoryBlockUtils;
 import ghidra.app.util.Option;
 import ghidra.app.util.OptionUtils;
 import ghidra.app.util.bin.ByteProvider;
+import ghidra.app.util.importer.MemoryConflictHandler;
 import ghidra.app.util.importer.MessageLog;
 import ghidra.app.util.opinion.AbstractProgramLoader;
 import ghidra.app.util.opinion.LoadSpec;
@@ -43,9 +43,9 @@
 import static fi.gekkio.ghidraboy.BootRomUtils.detectBootRom;
 import static fi.gekkio.ghidraboy.GameBoyUtils.addHardwareBlocks;
 import static fi.gekkio.ghidraboy.GameBoyUtils.populateHardwareBlocks;
+import static fi.gekkio.ghidraboy.Ghidra90Compat.createInitializedBlock;
+import static fi.gekkio.ghidraboy.Ghidra90Compat.createUninitializedBlock;
 import static fi.gekkio.ghidraboy.RomUtils.detectRom;
-import static ghidra.app.util.MemoryBlockUtils.createInitializedBlock;
-import static ghidra.app.util.MemoryBlockUtils.createUninitializedBlock;
 import static ghidra.program.model.data.DataUtilities.createData;
 
 public class GameBoyLoader extends AbstractProgramLoader {
@@ -124,7 +124,7 @@ protected List<Program> loadProgram(ByteProvider provider, String programName, D
                     program.endTransaction(id, true);
                 }
             }
-            if (loadInto(provider, loadSpec, options, log, program, monitor)) {
+            if (loadInto(provider, loadSpec, options, log, program, monitor, MemoryConflictHandler.ALWAYS_OVERWRITE)) {
                 createDefaultMemoryBlocks(program, language, log);
 
                 if (OptionUtils.getBooleanOptionValue(OPT_HW_BLOCKS, options, true)) {
@@ -149,11 +149,11 @@ protected List<Program> loadProgram(ByteProvider provider, String programName, D
     }
 
     @Override
-    protected boolean loadProgramInto(ByteProvider provider, LoadSpec loadSpec, List<Option> options, MessageLog log, Program program, TaskMonitor monitor) throws IOException, CancelledException {
+    protected boolean loadProgramInto(ByteProvider provider, LoadSpec loadSpec, List<Option> options, MessageLog log, Program program, TaskMonitor monitor, MemoryConflictHandler memoryConflictHandler) throws IOException, CancelledException {
         var as = program.getAddressFactory().getDefaultAddressSpace();
 
         var bootRom = detectBootRom(provider);
-        var rom = MemoryBlockUtils.createFileBytes(program, provider);
+        var rom = provider.readBytes(0, provider.length());
 
         if (bootRom.isPresent()) {
             var cgb = GameBoyKind.CGB.equals(bootRom.get());
@@ -200,7 +200,7 @@ protected boolean loadProgramInto(ByteProvider provider, LoadSpec loadSpec, List
                     var romX = as.getAddress(0x4000);
                     var offset = 0x4000;
                     var bank = 1;
-                    while (offset < rom.getSize()) {
+                    while (offset < rom.length) {
                         createInitializedBlock(program, true, "rom" + bank, romX, rom, offset, 0x4000, "", getName(), true, false, true, log);
                         offset += 0x4000;
                         bank += 1;
diff --git a/src/main/java/fi/gekkio/ghidraboy/GameBoyUtils.java b/src/main/java/fi/gekkio/ghidraboy/GameBoyUtils.java
index 8da4fe5..f478474 100644
--- a/src/main/java/fi/gekkio/ghidraboy/GameBoyUtils.java
+++ b/src/main/java/fi/gekkio/ghidraboy/GameBoyUtils.java
@@ -24,7 +24,7 @@
 
 import static fi.gekkio.ghidraboy.DataTypes.array;
 import static fi.gekkio.ghidraboy.DataTypes.u8;
-import static ghidra.app.util.MemoryBlockUtils.createUninitializedBlock;
+import static fi.gekkio.ghidraboy.Ghidra90Compat.createUninitializedBlock;
 import static ghidra.program.model.data.DataUtilities.createData;
 
 public final class GameBoyUtils {
diff --git a/src/main/java/fi/gekkio/ghidraboy/Ghidra90Compat.java b/src/main/java/fi/gekkio/ghidraboy/Ghidra90Compat.java
new file mode 100644
index 0000000..8cb9b88
--- /dev/null
+++ b/src/main/java/fi/gekkio/ghidraboy/Ghidra90Compat.java
@@ -0,0 +1,41 @@
+// Copyright 2019 Joonas Javanainen <joonas.javanainen@gmail.com>
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package fi.gekkio.ghidraboy;
+
+import ghidra.app.util.MemoryBlockUtil;
+import ghidra.app.util.importer.MemoryConflictHandler;
+import ghidra.app.util.importer.MessageLog;
+import ghidra.program.model.address.Address;
+import ghidra.program.model.address.AddressOverflowException;
+import ghidra.program.model.listing.Program;
+import ghidra.program.model.mem.MemoryBlock;
+import ghidra.util.task.TaskMonitor;
+
+import java.io.ByteArrayInputStream;
+
+public final class Ghidra90Compat {
+    private Ghidra90Compat() {
+    }
+
+    public static MemoryBlock createUninitializedBlock(Program program, boolean isOverlay, String name, Address start, long length, String comment, String source, boolean r, boolean w, boolean x, MessageLog log) {
+        var util = new MemoryBlockUtil(program, MemoryConflictHandler.NEVER_OVERWRITE);
+        return util.createUninitializedBlock(isOverlay, name, start, length, comment, source, r, w, x);
+    }
+
+    public static MemoryBlock createInitializedBlock(Program program, boolean isOverlay, String name, Address start, byte[] rom, long offset, long length, String comment, String source, boolean r, boolean w, boolean x, MessageLog log) throws AddressOverflowException {
+        var util = new MemoryBlockUtil(program, MemoryConflictHandler.NEVER_OVERWRITE);
+        var dataInput = new ByteArrayInputStream(rom, (int) offset, (int) length);
+        return util.createInitializedBlock(name, start, dataInput, length, comment, source, r, w, x, TaskMonitor.DUMMY);
+    }
+}