diff --git a/backend/genesys/gl841.cpp b/backend/genesys/gl841.cpp
index 2b4b347fc..2d544f07c 100644
--- a/backend/genesys/gl841.cpp
+++ b/backend/genesys/gl841.cpp
@@ -779,8 +779,7 @@ uint8_t *table;
             table=tdefault;
         }
         dev->interface->write_register(0x66, 0x00);
-        dev->interface->write_gamma(0x28, 0xc000, table, 128,
-                                    ScannerInterface::FLAG_SWAP_REGISTERS);
+        dev->interface->write_gamma(0x28, 0xc000, table, 128);
         dev->interface->write_register(0x5b, 0x00);
         dev->interface->write_register(0x5c, 0x00);
     }
diff --git a/backend/genesys/gl843.cpp b/backend/genesys/gl843.cpp
index acb2791a8..53b9725e3 100644
--- a/backend/genesys/gl843.cpp
+++ b/backend/genesys/gl843.cpp
@@ -652,8 +652,7 @@ gl843_init_registers (Genesys_Device * dev)
             0x6a, 0x73, 0x63, 0x68, 0x69, 0x65, 0x6e, 0x00,
         };
 
-        dev->interface->write_buffer(0x3c, 0x3ff000, data, 32,
-                                     ScannerInterface::FLAG_SWAP_REGISTERS);
+        dev->interface->write_buffer(0x3c, 0x3ff000, data, 32);
     }
 }
 
@@ -679,8 +678,7 @@ static void gl843_send_slope_table(Genesys_Device* dev, int table_nr,
 
     // slope table addresses are fixed : 0x40000,  0x48000,  0x50000,  0x58000,  0x60000
     // XXX STEF XXX USB 1.1 ? sanei_genesys_write_0x8c (dev, 0x0f, 0x14);
-    dev->interface->write_gamma(0x28,  0x40000 + 0x8000 * table_nr, table.data(), steps * 2,
-                                ScannerInterface::FLAG_SWAP_REGISTERS);
+    dev->interface->write_gamma(0x28,  0x40000 + 0x8000 * table_nr, table.data(), steps * 2);
 }
 
 static void gl843_set_ad_fe(Genesys_Device* dev)
@@ -1794,8 +1792,7 @@ void CommandSetGl843::send_gamma_table(Genesys_Device* dev, const Genesys_Sensor
         gamma[i * 2 + size * 4 + 1] = (bgamma[i] >> 8) & 0xff;
     }
 
-    dev->interface->write_gamma(0x28, 0x0000, gamma.data(), size * 2 * 3,
-                                ScannerInterface::FLAG_SWAP_REGISTERS);
+    dev->interface->write_gamma(0x28, 0x0000, gamma.data(), size * 2 * 3);
 }
 
 /* this function does the led calibration by scanning one line of the calibration
@@ -2851,8 +2848,7 @@ void CommandSetGl843::send_shading_data(Genesys_Device* dev, const Genesys_Senso
 	}
     }
 
-    dev->interface->write_buffer(0x3c, 0, final_data.data(), count,
-                                 ScannerInterface::FLAG_SMALL_ADDRESS);
+    dev->interface->write_buffer(0x3c, 0, final_data.data(), count);
 }
 
 bool CommandSetGl843::needs_home_before_init_regs_for_scan(Genesys_Device* dev) const
diff --git a/backend/genesys/scanner_interface.h b/backend/genesys/scanner_interface.h
index 03c713249..e9c26abf2 100644
--- a/backend/genesys/scanner_interface.h
+++ b/backend/genesys/scanner_interface.h
@@ -56,11 +56,6 @@ namespace genesys {
 class ScannerInterface
 {
 public:
-    enum Flags {
-        FLAG_NONE = 0,
-        FLAG_SWAP_REGISTERS = 1 << 0,
-        FLAG_SMALL_ADDRESS = 1 << 1
-    };
 
     virtual ~ScannerInterface();
 
@@ -77,10 +72,10 @@ public:
     // GL646, GL841, GL843 have different ways to write to RAM and to gamma tables
     // FIXME: remove flags when updating tests
     virtual void write_buffer(std::uint8_t type, std::uint32_t addr, std::uint8_t* data,
-                              std::size_t size, Flags flags = FLAG_NONE) = 0;
+                              std::size_t size) = 0;
 
     virtual void write_gamma(std::uint8_t type, std::uint32_t addr, std::uint8_t* data,
-                             std::size_t size, Flags flags = FLAG_NONE) = 0;
+                             std::size_t size) = 0;
 
     // GL845, GL846, GL847 and GL124 have a uniform way to write to RAM tables
     virtual void write_ahb(std::uint32_t addr, std::uint32_t size, std::uint8_t* data) = 0;
diff --git a/backend/genesys/scanner_interface_usb.cpp b/backend/genesys/scanner_interface_usb.cpp
index ddc25bf09..592276750 100644
--- a/backend/genesys/scanner_interface_usb.cpp
+++ b/backend/genesys/scanner_interface_usb.cpp
@@ -351,7 +351,7 @@ void ScannerInterfaceUsb::bulk_write_data(std::uint8_t addr, std::uint8_t* data,
 }
 
 void ScannerInterfaceUsb::write_buffer(std::uint8_t type, std::uint32_t addr, std::uint8_t* data,
-                                       std::size_t size, Flags flags)
+                                       std::size_t size)
 {
     DBG_HELPER_ARGS(dbg, "type: 0x%02x, addr: 0x%08x, size: 0x%08zx", type, addr, size);
     if (dev_->model->asic_type != AsicType::GL646 &&
@@ -362,19 +362,9 @@ void ScannerInterfaceUsb::write_buffer(std::uint8_t type, std::uint32_t addr, st
     }
 
     if (dev_->model->asic_type == AsicType::GL843) {
-        if (flags & FLAG_SWAP_REGISTERS) {
-            if (!(flags & FLAG_SMALL_ADDRESS)) {
-                write_register(0x29, ((addr >> 20) & 0xff));
-            }
-            write_register(0x2a, ((addr >> 12) & 0xff));
-            write_register(0x2b, ((addr >> 4) & 0xff));
-        } else {
-            write_register(0x2b, ((addr >> 4) & 0xff));
-            write_register(0x2a, ((addr >> 12) & 0xff));
-            if (!(flags & FLAG_SMALL_ADDRESS)) {
-                write_register(0x29, ((addr >> 20) & 0xff));
-            }
-        }
+        write_register(0x2b, ((addr >> 4) & 0xff));
+        write_register(0x2a, ((addr >> 12) & 0xff));
+        write_register(0x29, ((addr >> 20) & 0xff));
     } else {
         write_register(0x2b, ((addr >> 4) & 0xff));
         write_register(0x2a, ((addr >> 12) & 0xff));
@@ -383,7 +373,7 @@ void ScannerInterfaceUsb::write_buffer(std::uint8_t type, std::uint32_t addr, st
 }
 
 void ScannerInterfaceUsb::write_gamma(std::uint8_t type, std::uint32_t addr, std::uint8_t* data,
-                                      std::size_t size, Flags flags)
+                                      std::size_t size)
 {
     DBG_HELPER_ARGS(dbg, "type: 0x%02x, addr: 0x%08x, size: 0x%08zx", type, addr, size);
     if (dev_->model->asic_type != AsicType::GL841 &&
@@ -392,13 +382,8 @@ void ScannerInterfaceUsb::write_gamma(std::uint8_t type, std::uint32_t addr, std
         throw SaneException("Unsupported transfer mode");
     }
 
-    if (flags & FLAG_SWAP_REGISTERS) {
-        write_register(0x5b, ((addr >> 12) & 0xff));
-        write_register(0x5c, ((addr >> 4) & 0xff));
-    } else {
-        write_register(0x5c, ((addr >> 4) & 0xff));
-        write_register(0x5b, ((addr >> 12) & 0xff));
-    }
+    write_register(0x5b, ((addr >> 12) & 0xff));
+    write_register(0x5c, ((addr >> 4) & 0xff));
     bulk_write_data(type, data, size);
 
     if (dev_->model->asic_type == AsicType::GL843) {
diff --git a/backend/genesys/scanner_interface_usb.h b/backend/genesys/scanner_interface_usb.h
index 06b51ffb0..33fb8fed2 100644
--- a/backend/genesys/scanner_interface_usb.h
+++ b/backend/genesys/scanner_interface_usb.h
@@ -67,9 +67,9 @@ public:
     void bulk_write_data(std::uint8_t addr, std::uint8_t* data, std::size_t size) override;
 
     void write_buffer(std::uint8_t type, std::uint32_t addr, std::uint8_t* data,
-                      std::size_t size, Flags flags) override;
+                      std::size_t size) override;
     void write_gamma(std::uint8_t type, std::uint32_t addr, std::uint8_t* data,
-                     std::size_t size, Flags flags) override;
+                     std::size_t size) override;
 
     void write_ahb(std::uint32_t addr, std::uint32_t size, std::uint8_t* data) override;
 
diff --git a/backend/genesys/test_scanner_interface.cpp b/backend/genesys/test_scanner_interface.cpp
index 12f726f32..d5dcaaa5a 100644
--- a/backend/genesys/test_scanner_interface.cpp
+++ b/backend/genesys/test_scanner_interface.cpp
@@ -137,23 +137,21 @@ void TestScannerInterface::bulk_write_data(std::uint8_t addr, std::uint8_t* data
 }
 
 void TestScannerInterface::write_buffer(std::uint8_t type, std::uint32_t addr, std::uint8_t* data,
-                                        std::size_t size, Flags flags)
+                                        std::size_t size)
 {
     (void) type;
     (void) addr;
     (void) data;
     (void) size;
-    (void) flags;
 }
 
 void TestScannerInterface::write_gamma(std::uint8_t type, std::uint32_t addr, std::uint8_t* data,
-                                       std::size_t size, Flags flags)
+                                       std::size_t size)
 {
     (void) type;
     (void) addr;
     (void) data;
     (void) size;
-    (void) flags;
 }
 
 void TestScannerInterface::write_ahb(std::uint32_t addr, std::uint32_t size, std::uint8_t* data)
diff --git a/backend/genesys/test_scanner_interface.h b/backend/genesys/test_scanner_interface.h
index acf0f6d4a..7861c0b83 100644
--- a/backend/genesys/test_scanner_interface.h
+++ b/backend/genesys/test_scanner_interface.h
@@ -74,9 +74,9 @@ public:
     void bulk_write_data(std::uint8_t addr, std::uint8_t* data, std::size_t size) override;
 
     void write_buffer(std::uint8_t type, std::uint32_t addr, std::uint8_t* data,
-                      std::size_t size, Flags flags) override;
+                      std::size_t size) override;
     void write_gamma(std::uint8_t type, std::uint32_t addr, std::uint8_t* data,
-                     std::size_t size, Flags flags) override;
+                     std::size_t size) override;
     void write_ahb(std::uint32_t addr, std::uint32_t size, std::uint8_t* data) override;
 
     std::uint16_t read_fe_register(std::uint8_t address) override;