diff --git a/README.md b/README.md
index 72c9ed8..6aa9517 100644
--- a/README.md
+++ b/README.md
@@ -8,11 +8,6 @@ Based on re3, uses some code from [Dreamcast](https://gitlab.com/skmp/dca3-game)
 
 See [TODO.md](/TODO.md) for more details on project state.
 
-Tested devices:
-- Belle with BCM2763 (700) - GLES 2.0
-- Anna/Belle with BCM2727 (E7, N8, E6) - GLES 2.0
-- S60v3.1 with PowerVR MBX (E90, N95) - GLES 1.1
-
 ## Device requirements
 
 - S60 3rd Edition FP1, S60 5th Edition (non-Nokia), Symbian^3 or later
@@ -20,6 +15,11 @@ Tested devices:
 - 128 MB RAM with at least 50 MB free (won't run on regular 64 MB N95 unless you disable all textures)
 - Functional E: drive with 400 MB of free space (will be more as it'll start to support audio)
 
+Tested devices:
+- Belle with BCM2763 (700) - GLES 2.0
+- Anna/Belle with BCM2727 (E7, N8, E6) - GLES 2.0
+- S60v3.1 with PowerVR MBX (E90, N95) - GLES 1.1
+
 ## Building
 
 Import bld.inf in Carbide.c++ with Symbian^3 or newer SDK, add PKG file to SIS Builder and build the project.
diff --git a/group/librw.mmh b/group/librw.mmh
index b38f518..2276d21 100644
--- a/group/librw.mmh
+++ b/group/librw.mmh
@@ -25,4 +25,4 @@ SOURCEPATH ../vendor/librw/src/ps2
 SOURCE pds.cpp ps2.cpp ps2device.cpp ps2matfx.cpp ps2raster.cpp ps2skin.cpp
 SOURCEPATH ../vendor/librw/src
 SOURCE raster.cpp render.cpp skin.cpp texture.cpp tga.cpp tristrip.cpp userdata.cpp uvanim.cpp world.cpp
-SOURCE assert.cpp
+SOURCE assert.cpp printf_stub.c
diff --git a/sis/re3.pkg b/sis/re3.pkg
index 9374b6b..4b38c53 100644
--- a/sis/re3.pkg
+++ b/sis/re3.pkg
@@ -7,7 +7,7 @@
 %{"nnproject"}
 :"nnproject"
 
-IF (NOT package(0x20009A80)) OR (NOT package(0x2002372A)) ; old or missing openc
+IF (NOT package(0x20009A80)) OR (NOT package(0x2002372A)) OR (NOT package(0x10282872)) ; old or missing openc
     "incompatible_openc.txt"-"", FT, FORCEABORT
 ENDIF
 
diff --git a/src/skel/symbian/symbian.cpp b/src/skel/symbian/symbian.cpp
index b8f38ae..a07a202 100644
--- a/src/skel/symbian/symbian.cpp
+++ b/src/skel/symbian/symbian.cpp
@@ -96,6 +96,7 @@ static bool spinning;
 bool qwerty;
 bool touch;
 bool moreVram;
+bool powervr;
 
 void _InputTranslateShiftKeyUpDown(RsKeyCodes *rs) {
 }
@@ -574,6 +575,17 @@ public:
 		
 		eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext);
 		
+		const char* renderer = (const char *)glGetString(GL_RENDERER);
+		if (strstr(renderer, "MBX") || strstr(renderer, "SGX")) {
+			// use pvrtc
+			powervr = true;
+		} else if (strstr(renderer, "VideoCore")) {
+			// use etc1
+		} else {
+			User::Leave(KErrNotSupported);
+			return;
+		}
+		
 		setlocale(LC_ALL, "");	
 		setlocale(LC_CTYPE, "C");
 		setlocale(LC_COLLATE, "C");
diff --git a/vendor/librw/src/gl/gl3shader.cpp b/vendor/librw/src/gl/gl3shader.cpp
index 5e37304..c217a85 100644
--- a/vendor/librw/src/gl/gl3shader.cpp
+++ b/vendor/librw/src/gl/gl3shader.cpp
@@ -189,8 +189,13 @@ compileshader(GLenum type, const char **src, GLuint *shader)
 	glShaderSource(shdr, n, src, nil);
 	glCompileShader(shdr);
 	glGetShaderiv(shdr, GL_COMPILE_STATUS, &success);
+#ifdef _DEBUG
 	printShaderSource(src);
+#endif
 	if(!success){
+#ifndef _DEBUG
+		printShaderSource(src);
+#endif
 		fprintf(stderr, "Error in %s shader\n",
 		  type == GL_VERTEX_SHADER ? "vertex" : "fragment");
 		glGetShaderiv(shdr, GL_INFO_LOG_LENGTH, &len);
diff --git a/vendor/librw/src/printf_stub.c b/vendor/librw/src/printf_stub.c
new file mode 100644
index 0000000..04df7e5
--- /dev/null
+++ b/vendor/librw/src/printf_stub.c
@@ -0,0 +1,11 @@
+#ifndef _DEBUG
+#include <stdio.h>
+
+int printf(const char * __restrict s, ...) {
+	return 0;
+}
+
+int puts(const char *s) {
+	return 0;
+}
+#endif